Jaunter is a nifty and interesting prestige class found in the Expedition to the Demon web pits, it really appeals to me as it can help me fulfilling one of my favourite character concepts. A mobility-based character, specifically a teleport by-attack.
The class is only 4 level long, but give nice abilities powerful abilities.
Over the course of the class one gets
Benign Transportation, Baleful Transportation, Teleport, Plane Shift as Su abilities; usage per day depends on your jaunter level, dex modifier and the ability itself (for example Teleport uses two "charges" while Bening transportation just one).
Fast movement
Freedom of movement up to 8 rounds a day
Dimension Door like ability. Actually more similar to Shadow jump, you can as a move action teleport as if using Dimension Door up to 30 feet per class level per day (so 120 maximum); but you can ration the distance teleported.
in a 3/4 BAB, good reflex save, decent HD and decent skill list chassis.
All in all a nice class right? but the deal breaker is the adaptation section that mentions that this class can become a full casting advancement class, by changing the SLA to add to the spell list (nice for sorcerers and Favoured souls).
I am considering using this class in a gish build in the near future, but I want to hear what you thing about it first.