I know it's technically an altcoin, so I donno if this is the right forum section (please tell me the right one if not) but it's a fork, not something completely separate so I hope this is OK.

Alright here's the situation, I am a long-time, but not very active Bitcoin user. I've always used good old bitcoin-qt. So I've got a little bitcoin in that, right? And now I hear that I automatically have Bitcoin Cash too, without even knowing (score! I guess?) but I'm not sure how to make use of it. I look at bitcoincash.org (horrible website, by the way, entirely made of javascript) and check out the list of supporting clients. One is a special version of Bitcoin Classic, so the same old interface I'm used to. I intend to go with that unless someone knows a good reason to do otherwise.

With that out of the way, I've got a couple questions:

1. Would most people consider that client trustworthy? Is it OK to let it directly access a copy of my regular wallet?
2. To avoid having to downloading ~140GB of blocks all over again, can I copy the blocks and chainstate folders from my regular client? Or will it get confused if that contains blocks passed the split date?