Tough call - if you haven't tried out anything really hard like glass, it's hard to say if you'd like it. I love it, and my second anal toy (after a silicone plug) was this:
One thing to keep in mind is that glass, because it's so rigid, generally feels bigger than it actually is. Also, be very careful with thrusting, since it can bruise you. If you're curious about glass toys I'd say start small at first.
As for jelly, I got one jelly dildo as a gift and I hate it. I can only use it with a condom (which I generally don't do since I don't share toys) since I had a bad reaction to the material. I would never buy a jelly toy to use anally. NEVER.