Lynn,
I use them, although fairly sparingly. I got them from Jeremy Huff at the New York Show. He certainly recommends them and is a quite prolific dart breeder. I have to imagine that gut impaction could happen, but I don't think it is really a huge concern. Just use them sparingly. I love them because they're a little bigger and slower, and some of my frogs benefit from that. I think they're worth culturing, and they're certainly easy enough.


~Alex