I've tried the 170 and the 150 next to each other ....the 150 shines easily as far if not further. And at the furthest distance you see more .in fact one night something was running out the beam in a 170 ,and my mate asked me to put the 150 on and it lit it right up.
But agree ,if they done a bigger one maybe 200 mm they would ,in my opinion, be perfect.
I have both so just saying what I've found.
Also if you have a set up already there's probably no need to change ,but if I had a choice of buying one of these or a 170 plus a battery i'd pick a 150 on value for money if nothing else