Id get V2s my self but only if you can brake propperly – ie dont drag em
shimano if you want to fit and forget then replace every couple of years
hope if you plan to keep for a fair while and want spares availibility ! – since they rectified the old two piece calipers pushing them selves apart under hard braking when i had E4s
currently have x2 races on one bike(described as underpowered in the mag) but they certainly have more than enough power for me – and ive have mono m4s in the past – as with all hopes centering the caliper is key – have it slightly off and they brakes feel woeful !
got mono minis on the big bike and they are performing admirably – how ever my old shimano XTs and Saints are in the spares bin as they weap fluid past the piston seals and this is not a spare – new caliper required.