First post so go easy!
I've been looking at the suresignal for some time now in the hope it would solve the incredibly poor vodafone signal in our home. Called in the Derby Westfield store today and they had stock, best still I was expecting the price to be £50.
The pricing is dependent on your mobile tariff (I'm on the £40 iPhone tariff) and you'll need a >1Mbps broadband connection to use it.
The cell takes some time to initialise, mine taking a couple of hours. Now though I have 5 bars in every room whereas before I could only get a signal in one bedroom.