I know that with some of the more recent codexes there have been some options that actually encourage people to not mount up their entire armies. Things like Thunderwolves, Reaver Jetbikes, Hellions, Blood Angel's SC's and Assault Marines, etc. Combined that with the armies that don't usually take many tanks anyway - Chaos Demons, Tyranids & Orks - well just how much Mech are you seeing on the local and tournament scene? And have these new units influenced you towards changing your army comp?