I use 3 via a smartphone if that counts? I've always been very pleased with it and have the £15 talker package plus a £5 unlimited data. Via bluetooth to a laptop it works well too!
A great many of the pro 'togs I see are using these at Red Carpet events. Thankfully, my photos are not as time-critical as theirs, but they do the job a treat.
Cheers,
James