Been using the f1 ltd for about a week now. You do notice a weight difference and it has taken me a couple of days to get used to the "wave" pattern under your toes in the insole.
Really good shoe.
I contemplated getting these but ended up going with the SC5 instead. Mostly the same tech in them but at £64 vs £87 I couldn't really warrant the extra cost for a slightly lighter shoe as I'm not a high level player. I just get sore feet/blisters easily so will spend a bit more to spare myself discomfort. Last night after 3 hours of pretty continuous play my feet weren't sore at all compared to the SHB 72 shoes I had before (insole was completely flattened at ball of foot and heel). Also the rebound from the 3 layer power cushion was very noticable after any lunge, haven't tried dropping eggs on it though :P
The wave pattern does make the insoles feel like your sock has bunched up or something else gone wrong to begin with but doesn't take long to adjust to.
I got my shoes on Saturday and I noticed the plastic "Flywire" type topcoat doesn't really conform to the foot like traditional shoes do. The shoes don't have any kind of overlay in design that helps move with the foot. It doesn't flex well with the soles. Here is a pic:
Once they are laced up though, you won't notice this as much. There is very little material in the uppers of these shoes, especially the togue.
Here is the weight of the shoe compared to some others in 25.5cm:
Overall, the shoes are ok, but not really worth the premium if you are going to pay the full retail price.
So far, I found the ShbF1 a pretty tight fit. You may want to get a half size bigger. The cushioning is quite good on the F1, especially when you strike the heel directly. The forefoot seemed just ok. I think the Asics provides the best cushioning if you have gel in the entire shoe. However, the weight of the shoe is usually heavier. I haven't tried the Gel Blade yet or some Asian market ones in a long time.