Hi Greg,
I purchased one from them four years ago, and have never looked back. The model that you are buying is now slightly modified but at a guess not that much difference in the way that it performs. I have had no problems with it, other than when I let it freeze up one winter (my own fault). Even then they had it in, pressure tested it and replaced all the split pipes & connectors at a reasonable cost of about £60.
As it happens, I have just outgrown mine and I am in the process of buying a larger system from them. All in all I highly recommend 'Ionics'
Richie.