As an instructor I far prefer the Tomahawk to the Cessna as a workplace. Lots of space and everything within reach, good visibility in the cockpit and not squashed up next to the student. Credit to the instructors who contributed towards its design.
Studes who have flown ours have rarely gone back to Cessnas.
As an aircraft owner, I can say that the Tomahawk is simple and reliable, and operating costs are very reasonable.
There has been a lot of rubbish talked about Tomahawks by people who have never flown them.
Fact and figures and other interesting stuff here:
http://groups.yahoo.com/group/piperpa38tomahawkclub/