My own experience with piezo lighters on stoves (mine was a Primus Micron) is that they are really wonderful as long as they work. However, mine stopped working after about 4 years. At that point they become useless weight. I always took a lighter and a few matches (the REI emergency kind) anyway.

My current stove is a Primus Micron Ti (2.4 oz.). I really didn't buy it for the 1 oz. weight saving over the other one (older Primus Micron) but because when going out with my son's family (6 of us), we really need 2 stoves--and the Ti model was on sale. The Micron Ti works really well and I'm very satisfied with it.

I agree about the MSR fuel canisters!