I've had the Home Master Artesian Full Contact System for 5 years now and I still love it. I would make the purchase again without any hesitation. I live in Las Vegas where we have very hard water and the system has held up great. I frequently get compliments on the water and I love that it tastes great. I installed the unit myself with the help of a friend. It was simple and their instructions were very easy to follow. It is easy to maintain and even upgrade when you change out the filters. I've had great luck with customer support. They are friendly and easy to access. They even walked me through the filter changes over the phone.
This is a great US-Based company that stands behind their product. As you can see from the other reviews I'm not the only satisfied customer! You may be able to find a cheaper product but you may not get more than a year out of it. I'm going on 5 years with no leaks and great tasting clean drinking water!
TIP: I would suggest going with the permeate pump unit add-on as it reduces the amount of wastewater from 4:1 to 1:1 and increases the speed of water production by 50%.