I have spent a ridiculous amount of time researching RO system over the past few years and finally pulled the trigger and bought this one. In short, I'm glad I did!We already have a whole house filter and our refrigerator also has a drinking water filter. Myself, I wasn't overly concerned about using that water, but with all the talk about all the chemicals and crap that's in our water, my wife decided so would no longer even drink that water and turned to drink bottled spring water, which has nano plastics in it and produces all that plastic waste from all those bottles. So, in light of all that, I decided that now was the time to get an RO system.Having experience with the typical RO systems that have the tank and all the tubing running everywhere, I knew I wanted a tankless system. They're also so much more efficient and produce much more water and take up far less space. I spent several more weeks going back through all the options and finally narrowed it down to two systems; the Waterdrop G3, and this iSpring RO500AK-BN, with the iSpring being the clear winner for a number of reasons.First, the company is amazing and they are located near Atlanta, where we live. Whenever I've called to ask questions, they just pick of the phone and are so helpful and personable. Michelle answered all my questions and I felt confident I was getting a system that met our needs. I absolutely love iSpring and feel that I will always have top-notch support for this product, should I ever need it.Secondly, I love that this system has the remineralizer built in, so you don't need to add an additional filter inline. This makes filter changes so simple and reduces connection points. This was important to me, knowing that my wife could easily maintain the system herself if she ever needs to.Those were the main reasons that stood out before I got the system. Now that we have it installed and have been using it for a while, I find many more reasons why I'm happy we chose this one.It's super-easy to install and comes with everything needed, provided that you have an electrical outlet located where you plan to install this. You do not need to be a plumber to install this. If you don't have an existing outlet, you will need to install one (or have an electrician do it, if you're not able to.) Luckily, we already had power under the sink for the disposal, so I had no problems converting the hard-wired disposal to a half-hot outlet, which now controls the disposal via the existing switch and provides a hot outlet for the RO system.All the parts and materials are extremely high quality.The system is super-quiet when operating! Seriously, I can barely hear it if the room is completely quiet. I've read that others are quite noisy; not this one.It takes up almost no space in our cabinet! (Still have room for all the crap that was in that cabinet.)Operation is simple and intuitive. It has color-coded indicators that show filter status, as well as audible alerts when filters are nearing end of life and/or need changing.Changing filters is as easy as it gets and takes literally 10 seconds. The design of the filters is also so much better than on traditional RO systems, where I've often had the main O-rings go bad, leaks, etc. These should never have any of those problem because of they way they're designed.The included faucet is high quality and beautiful! It's listed as 'brushed nickel', but it blends perfectly with our stainless steel faucet, so I think it's more of the blend of brushed nickel and stainless. IDK, but it just looks very nice!The flow rate is amazing and even faster than our fridge water dispenser. It can also produce up to 500 gallons of water per day and the flow rate is continuous, unlike typical RO systems that slow down to a trickle when the tank runs out.It has a 2:1 pure to drain ratio, compared with 1:2 or 1:2.5 of a traditional RO system.And, most importantly, it produces the best tasting water I've ever had!All things considered, this is the best system I've seen in the $500-ish price range. You get a lot of bang for the buck with this one and exceptional quality and support. I actually like it better than some I've seen that are closers to $800-$900, which still don't have all the features of this one.Also, mine included a card to register for a 3-year extended warranty, which is really nice and added piece of mind. If you buy one, be sure to register it. I was getting an error when trying to register on their website, but I was told to just send an e-mail request and Sean responded the same day to advise that my warranty was registered. (Did I mention how helpful the iSpring folks are?)All things considered, I highly recommend this system and iSpring as a whole. I paid for this system and received no compensation for this review. In fact, I passed up on a couple of similar systems that were offered to me for free and instead decided this was what I wanted and purchased it myself.