I use it basically as a different type of teething toy. He gets to taste new things in the process. I don't think he uses it to actually eat anything, just to taste and soothe his gums. He likes it most of the time I give it to him. We have only done banana and watermelon so far (both frozen).
I love it and want to get another for extra / backup. I've only used it for banana, A loves it, he turns it around after he's done and uses the handle as a teether. kinda messy after its all mushed. Lol
We have one that I've put various fruits in. I clean it immediately because I imagine it could get pretty gross if left to sit. I like the idea of putting in frozen fruit.
Re: mesh feeders?
My husband just suggested this the other day. I hadn't even thought of it. Ours is still in the packaging! I'm going to try this!