Strengths: They are really cheap an look great. It's easy to feed a cable through and they always seem to work 100 per cent.
Weaknesses: Extremely limited stopping power comparing to LX, let alone Hope Mini, modulation of poor quality, do not work as well as others.
Overall: Had a set of LX levers but had to change them due to my girlfriend's "They do not look nice!"-type comments and as I was giving her the bike I thought I'd keep the good stuff... They work but if you ride hard and still have V's you wanna be looking elsewhere. They do the job as long as you ride gently. And no, I did not try them with Avids, my brakes are LX with XT carts. Summing up, I WILL NEVER EVER BUY THEM AGAIN EVEN FOR MY COMMUTER. Too cheap and chearful for Shimano to work.
Strengths: cheap, pretty light for the price and they stop very well indeed.
Weaknesses: Not as good as LX levers and they don't have the break modulation, however, any compotent mechanic can set them up well
Overall: damn fine, really easy to set up and not too powerful if you're new to mountain biking (like my dad)Don't see any point in going higher to start with.