TRP stands for Tektro Racing Products and is basically the firm’s elite component range. I'd definitely recommend the 920s for those seeking topflight performance on a mid price budget. The lack of increments on the quick release might annoy puncture prone racers who regularly perform roadside wheel swaps, but other than that it's all good news.
The dual pivot callipers have a modified arch which, Shimano say, gives you a more linear response. Possibly – although you’d have to run them alongside the old model and concentrate really hard to notice much difference there. More significant is the brake block compound that provides significantly stronger power in both wet and dry conditions with a single trigger finger, giving you the confidence to ride faster into bends and brake later.