Really like what I see from Roach. He's listed as fast-medium but he's been quicker than that. Been fairly consistently at over 90mph, with one free-hit delivery reading 148.5kmph.
Edit: Wow, they've just shown a table of the fastest bowlers in the competition. I'll run down the top 5 for people who missed it:
Kemar Roach 151.9
Lasith Malinga 150.0
Tino Best 147.7
Shane Bond 145.8
Dale Steyn 145.3
Pretty impressive numbers there! Roach is ridiculously quick. Can see Lee and Johnson getting themselves on there today though.