Product review (5 stars): Fast hot water, as advertised
I installed this system a few days ago and am extremely happy with it so far.  I have never written a review on Amazon before, but saw this had no reviews and wanted to share some quick thoughts.

Installation is not hard, though you should definitely be comfortable working with plumbing and not be the type of person who is going to panic if there is some water on the floor.  I have no particular experience with plumbing and was able to get the system installed in about an hour and a half.  It would be even easier if the directions were more clear.  The pictures help a lot though, as does the fact that most of the pieces will only fit together in one way.  Be prepared to have a lot of water on the floor.  The best way to minimize this is to be very patient about collecting the water that will inevitably leak from your shutoff valves and not starting work until they have run dry.  Even a seemingly minor drip from the shutoff valves will wind up as a lot of water in your cabinet while you study the directions and work on the pipe fittings.  Also, make sure everything is VERY tight.  Tighten each connection until you can't tighten anymore.  The instructions talk about fittings being "snug" and suggest not over tightening in several places.  I tried this and had to disassemble everything after turning the water in the house back on because I had several leaks.  Don't go crazy, and be careful not to bend your copper pipes, but tighter is definitely better, especially for the compression fittings.

Operation is great.  The motor is extremely quiet and I can't even hear it unless the cabinet it's housed in is open.  It usually runs for about 30 seconds, and once it goes off I have hot water almost instantly at that faucet, and every other faucet in the house.  This is a very big improvement from the 2-3 minutes I would wait at that bathroom, and easily worth the cost of the system.

Durability appears good.  The hardware seems well made as far as I can tell.  And the motor is cleverly designed to be replaceable without disconnecting the plumbing.

Overall, would highly recommend this system for anyone dealing with a long wait for hot water.