My first 2 sessions on Twin Spin were very good, loads of playtime and several 100x and better wins in 3 hours of straight play.
I also had another few sessions were it was very cold.
I also have had several lines of 7's a few times, and one time diamonds.
I see a streaky nature: i am waiting for a few of those uberhits in short succession, i would run like hell afterwards.
I think it's best to play most of the recent slots like Twin Spin, Reel rush, Wild Rockets and of course Starburst, with a decent bankroll and a quick go on 0.05 coinsize, say 50 spins.
I think i have a good feel for them now and generally can tell if they are hot or not within those spins.
Toss in another 50 to make sure if you wish, but they are all capable of providing either playtime, but slowly sucking you dry, or a quick bankroll booster, and not too forget, most important they all have some streaky-natured potentially 500 to 1000x hits in their range.
I do like them, and disregarding most seasoned players here, the general consensus from the average player seems to be positive: i think they did a good job @ Netent, but i would like to see more releases like Secret of the Stones and Creature of the Black Lagoon!
Those are by far my favourites, since they have either quite original graphics and bonusrounds with huge potential, and are exciting to play, much more so then previously mentioned slots