I have had my 150L for 11 years now and pretty much use 100LL. It wasn't until a month a two ago(after reading the forum here) that I started to lean aggressively during taxi and cruise flying. I was taught not to worry about leaning until I get to 3000' msl or higher. I have never had a stuck valve in those 11 years(hopefully won't jinx myself here). Another thing if you buy a plane with millenium(excuse my spelling) cylinders or other newer cylinders they are made for 100LL.
Just my 2 cents.
