I got a "forcefield T-pro" earlier this year.
Very nice piece of kit, super quality, very comfortable (feels rather like leaning against a wall to begin with

), they're ventilated but still a touch warm when the weather's over 25C unless your jacket has decent ventilation, which mine doesn't

. They mould to your shape as they warm up, so don't judge the comfort immediately. Recommend it with no hesitation.
I'm about 5' 11" and have a medium size T-pro, seems just the right length for me. I'd say it would be OK from typical 5' 9" to 6' 1". Also come in small and large, plus kids sizes.
Got mine from Davies Odell direct
http://www.tprobodyarmour.co.uk/ff_back.html
but also stocked at Infinity motorcycles.