i've just got some lumi led sys4 with the big battery, happy so far, battry life is claimed at 7.5 hours on high, i've done 4hrs on the first charge and the 50% indicator hasn't appeared yet, so 7.5 hours is probably erring on the cautious side (as the battery needs a few cycles to reach max capacity)
have the flood, and to me it's plenty of light, even in singletrack i can happily ride without a headtorch (but will prob get a p7 for this)
i was sceptical about the boost mode, this gives you the option of having the highest setting on for 3 mins (or you can choose to have on all the time) - but lumicycles reasoning seems spot on, high is fine for 99% of a ride, and having the boost mode on means your eyes just get use to it, so not as bright as first appears
i do try and buy british, both to keep the skills alive, and because it's easier to get things fixed, especially so with lights - so my shortlist was all british, if something goes pop, a repair is just a phone call away