Strengths: Extra travel over stock Mars,on 2001 Mt. Vision Pro,much stiffer,slight weight penalty,but bike rides much better,particularly when the going gets rough.I onlt paid £195 from Merlin,so an absloute bargain IMHO.
Weaknesses: None really,although it's a little early to comment on long-term reliabilty,but no problems so far.
Overall: Big improvement on stock fork,at a bargain price,I'm really pleased with them.