I have yet to give up on a toy, and I own the Jollies Firm, the Dai-Do #3, and the Cal Exotics Passion Wave. They all require warm-up, and the right mood, and there are times where they are simply not the right toy for the moment, but they've all proven worth the trouble. Especially those first two.
That said, no toy is worth actual injury, if you really can't manage it, or aren't ready to attempt it. I have the Jollies Luna sitting unused in my toy trunk, waiting for the day when I'm feeling particularly brave.