I've been running Twisters this whole season (11 races by now) and am very happy with them. Yes, I've chunked an odd tire during that, but I have done the same before, previous few years I've used mainly GRP and some Enneti. I don't recall breaking a Twister wheel yet, but I've been using only the "normal" serpent-style wheels, not the lightweight ones. For the price (much cheaper than anything else available in EU) they are hard to beat.
If you're in Europe, I can warmly recommend http://www.storm-discount.com/
, I have ordered 3 times from them this summer, total of 100+ pairs, very good communication and reasonably quick delivery.