I have a 1.5 year old springer spaniel, and I've spent gobs of time and money trying to find toys that will withstand the jaws of Luke. It's very disappointing when you spend $12 on a new toy and he's broken pieces off of it within 10 minutes. I've looked at all the toys claimed to be for heavy chewers, and he has destroyed most of them. I was a bit skeptical about the Bumi because I had tried another hard plastic toy which he just didn't like (the only toy he's rejected).
Well I've had the Bumi for a few months now and it's a big hit. Not only does Luke love playing with it, there's not a mark on it! Looks brand new! It did take him a little while to warm up to it since it's a bit hard for him to get a good grip on it. But because he can't destroy it, we can leave it lying around, so he now loves to go get his Bumi and bring it to us growling for a game. What has surprised me even more is that our 10 year old Westie also likes to play with it, even though she has a strong preference for soft, squeakie toys.
So I just wanted to say thanks. Your toy is the first one I've bought that actually lives up to its claims.