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Covered extensively in this thread too if you search.
I had mine set up ghetto tubeless on some Pacenti SL25 rims and they were excellent. I took them off to try gp4000s instead as I wanted something faster - the 25mm gp4000s didn't really any faster but felt a lot less comfortable and I lost the off road ability 37mm tyres give you.
Tubeless at 35-40 psi they are truly sweet.
I'm going to put them back on today, so obviously I regret taking them off now.
Anyone tried the Vittoria Voyager Hyper? Lowest rolling resistance in their class (apparently). I decided to not buy my tyres on looks this time around. It's for a audax bike and thinking either the 35mm (most likely) or 38mm (much less likely).