pro2s are good, but freewheels and threaded hubs are hassle free. it's easy to replace one or the other if something goes wrong. if you bought this it's prety heavy at 184g but you could easily cut it down to just protect where you need it most instead of 360 protection. plus if you ran a 108ep freewheel you'd have 132 effective engagements thats an engagement every 2.72 degrees, mm sharp. there's also the bonus of freewheels lasting longer on the rear since alot of the force of stamping on pedals etc is taken by the chainring and chain before it hits the freewheel.
weight weenies:
pro2 = 427g
tryall cnc hub = 183g
echo ti freewheel = 146g
(329g altogether)
thats 98g lighter... (even better when you consider the pro2 has no sprocket/spacers on it) £248
even a more budget friendly echo tr hub (193g) and tryall 108ep (179g) is 55g lighter.... £112.50
obviously you need to factor in the extra weight of more chain/bigger bash up front, and the weight not being as centered compared to FFW... i'm not ranting that out. i wrote numbers and stuff, thats good enough for 3 am
INB4 bias, i run a pro2 an i love it long time, i just wanted to add some balance after rupintart had his pro2 moment. pro2 will outlast a freewheel any day (in my opinion)