I've tried the majority of them.
Living in New Zealand I have ready access to the brand.
Here's my thoughts:
M44- give it a higher pitch rate, otherwise it takes off slowly, and can throw some booze etc. into the beer. if you do this, the beer will finish out nice and fast aswell. cleaner than US-05, drops clearer as well.
M21- Wit yeast, a really nice character, lower attenuation than I expected. but clean, with a traditional type wit character. (maybe a little extra banana though)
M47- Abbey. Closest to WLP530 IMO. Nice phenolics, keep control of temps I ran at 20-22 Deg C came out nicely. a strong beer ,but its balanced out nicely.
M36- Used ages ago, want to give it another go. last time it didn't finish out, (i believe it was my issue not the yeast) a friend gave me a rigger of his APA using this, and it was nice, although the hops were muted slightly compared to M44.
M29-horrible. It'll ferment your mother if you let it. Attenuates waaaay too far. same goes for french saison (both are terrible IMO)
Empire( I forget the code) - nice enough - used in barleywine, worth experimenting.
Tripel - haven't tried this, but got a taste of someone else's.... its ok, but its overly phenolic, think banana milkshake
newcastle dark. i really like this one, it just doesn't attenuate well enough for me.
california common - haven't tried it
lager yeasts - i havent tried, but the ones ive had of other brews made with these, have come out well. the only comment i'd make is the bohemian doesn't really fit, its more lager than pilsner.
am i missing any?