Anybody try a transom jack on an aluminum boat, would be interested in any info good or bad.

I know several people running hydraulic jack plates on their cans.  We do a lot of river fishing and the river near me has tons of trees, sand bars and other obstructions that play havoc on a motor all the way down in the water.   Sometimes you have to get you speed up and actually slide over tree trunks to get up/down the river.   Being able to raise the motor straight up works much better than having to try timming the motor up.  One of the best rigs I've seen is a guy has a 16 Aluminum tunnel hull, 60 hp Merc with hydraulic jack plate.  He can run WOT with no worries about what's under him.  He said once he get on plane he can raise the motor up until he only needs 2 1/2" of water to run WOT.   I like his much better than the jet drives I've seen running the river.  Last year the DNR guys ripped their jet drive off the back of theirs on that river.