I don't usually post much to these kind of threads, but seems as though I can answer from 2 perspectives. AS a vendor or as a user. You decide what one I am. I sell and use the AC convertors from Tx, I have found them to be the best, most importantly, functionally, life span and equally important, Tx AC has always stood behind their product with me, no questions asked!! I ran 9.70'swith my 200r for a year, no prob. I ran faster with my 400 from AC with their convertor for another 2 years before I began to overpower the convertors. I changed over this year to an ATI, only because I didn't want to spend the time testing with a new AC. I was told this convertor would work right now, someone else did the R$D already. As for my shop, AC from Tx is all we use these days, if they didn't I would have a bunch of pissed off customers. I'll just say this, every convertor builder out there has lost a convertor, it's what they do when it happens that I look at. AC has ALWAYS stepped up to the plate for me and my customers.
Just to show how much I like them, the next 10 guys that order one will get a $75.00 discount!! You tell me what you think after that!! Check out Cottons specials forum on my web site for details.. hope that helps,