Well, as long as you trade in/out with BTS/BitUSD, you're fine and you trust the blockchain. If you pull out in a respective currency with OpenLedger or RuDEX or something though, yes, there's an element of trust.
If you're on BTS, vote for the new proposal by Bill Butler to re-haul the UI! I just did.
Is a while since I've used it but will do.
It can be a bit clunky in its current state, but it's a work in progress that relies on open source development. Luckily, new worker proposals are coming in.
Yes it is still early days.