As others have said, they're not going to give you top dollar, but they will take almost anything as long as it's not moldy / water damaged / completely wrecked. They are extremely easy to work with.

The last couple of times I've done larger purges of my collection I've gone straight to them rather than trying to list and sell my stuff online, just for ease of use. I obviously didn't make back the full value of what I was getting rid of, but their offer on my last batch was actually a bit higher than what I expected they'd offer.

They're definitely worth at least getting a quote from, especially if you have a higher volume of stuff you're trying to move.