Yes, they are all quite enthusiastic. So is Colleen, but like Colonel Meow, I think she's great and seems genuine. It seems the HSN hosts are either trained better at feigning enthusiasm, or truly do just feel more passionately about their products.
I suppose it helps that - as discussed recently on another thread - HSN generally has much better prices than The Q, so you feel more in agreement with their hosts when they rave about the prices. As much as I like some of the QVC hosts, I can't help but roll my eyes a lot and talk back at the TV when they try to convince me what a great deal something is just because there are six easy-pays (doesn't mean it's cheaper!), or it's, like, $10 off a $300 bag I could get for half off at an online retailer.