Much better routing than Garmin. HD Traffic is very good, much better than normal RDS traffic, but super slow to start. Sometimes it takes 10 minutes to lock on. Traffic receiver is built in, but costs $60 a year after the 1st year.
The entire GUI is aweful. The POI interface is terrible and very very slow. The live services are decent but SOOOO slow. They run on AT&T 2G, so a simple Google POI search can take 5+ minutes
For just getting you from point a to b, the TT beats the Garmin 2555 hands down, but so many other things about the unit are so bad it's hard to so it's worth the trade off.