I love the SP2 - I don't like the trackpad on the type cover2 and honestly rarely use it unfortunately.
About the Type/Touch trackpad, someone pinned down some kind of performance bug by testing between the bluetooth adapter and attached to the Surface: http://www.surfaceforums.net/forum/...07-track-pad-driver-bug-type-cover-1-2-a.html
Supposedly it works beautifully with the bluetooth adapter but not when attached.