Megatron - There is no seperate product, it works on vB3/4 (different xml installers however), the same goes for Lite.
el-q6r - What do you use to "define" mobile usage? vB Optimise will cache styles after vBulletin has decided which style to use (which includes user selection, forum/blog overrides, etc..), so aslong as any method used keeps within that format it shouldn't be a problem.
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