FREEZYJOSY  TODDI is right, Garmin should license TrailRunner…  
(Version 2.1.5)

FREEZYJOSY  I like Ascent for its raw data quality. But to be honest the app is really a feature beast with the sacrifice of "beautifulness" and "Apple likeness".

I also use TrailRunner, which is a free app (though donation ware).

With TrailRunner it's just the other way around, less features, more lovableness.

It really depends on what your goals are and what keeps you motivated.

And the third in the pack - Garmin Training Center - is just plain crap. Garmin should just buy Ascent or TrailRunner and make their customers happy. Personally I would suggest TrailRunner to them.

But as it looks, they don't care anyway.  
(Version 1.9.7)

FREEZYJOSY  I use TrailRunner for like over a year now. This spring I also forged out the money for a Garmin ForeRunner 305 and I must say that I am impressed on how TrailRunner has developed. I can't even think if I would have bought the Garmin if TrailRunner wasn't there.

TrailRunner really keeps me motivated on running. And as I can see from the latest Beta for TrailRunner 1.8 it looks like the developer explicitly heads into the biking sector by giving a direct access to the diary in the main window.

I think TrailRunner is a killer app and would be even worth 40 USD if it was shareware (in fact TrailRunner is freeware with a donation hole to fill if you like).

Berbie, keep up the good work.  
(Version 1.7v250)

FREEZYJOSY  I think it's ok the developer goes with the development progress of apple and tries to integrate the latest technology into TrailRunner. TrailRunner for Leopard is much faster and cleaner as the 1.6 version. Looks like it was worth it.

And for the ones still using Mac OS X Tiger, there's a compatibility version available on the websites download section.  
(Version 1.7v250)