I've used them before to short BSV. No issues in terms of deposits/withdrawals.

However, just be aware that the markets that they do offer don't really have a lot of liquidity when you compare them to the likes of Bitmex and Deribit, so you might find liquidating large positions very difficult for small cap alts.

Otherwise, I'd say that you can trust them with small amounts at least until news comes out that they cannot be trusted. I'd only trade coins that I can't find traded elsewhere though.