I have Driven D3's, which are a "knock-off" of the Rizoma. I've probably ridden them 1000 to 1500 miles. I'm not the kind of person that puts a lot of emphasis on the feel of such things, but I can say the rubber portion is very soft. The aluminum sleeves are also a really nice touch, and I get very many compliments for them. The only downside is they seem to be wearing down noticably already.
Hope that helps some, it's not the Rizoma's but I'd waiger they are half the price and damn near the same thing.