Firstly, ive been a member of CH since around 2007, If their trainers weren't trustworthy I still wouldn't be with them and exclusively use them for trainers. Hell, I even recommended a trainer maker that did work on Dungeon Defenders years back to come here and provide his services for that game. Wouldn't do that if CH wasn't 100% legit.
Secondly, the trainer looks different because it isn't made by the ones that normally make trainers, that being Cal and 0x, they each have a different graphical style. nothing more nothing less.
False positives are going to happen due to the nature of how trainers work and some AVs detect code.
[Edited by DigitalIP, 2/4/2016 5:04:31 AM]