There have been many reports on the SSCA board that once the warranty is up Xantrex will not fix their products. Instead they offer to sell you a new one at about the same price that you can buy one for at discount.

So, in effect, you are paying for one year's use and from then on it is a crapshoot.

Disclaimer: I have no personal experience with them and with their reputation I won't be getting any.