Strengths: Really is excellent for pacing and checking how far you have run. I find the Training Partner very good as it helps push me that much harder when I need to, and slows me down when I don't need to. It just teaches you a different way of running. I look forward to analysing my run on my laptop as much as the run itself! Especially useful when you use it with Google Earth
Weaknesses: Sometimes takes a while to get a signal so I leave mine outside while I lace up my shoes. The buttons can be a bit fiddly as they are small - sometimes leads to me pressing the wrong ones. I would prefer a colour screen and a console that was a little less bulky but you do get used to wearing it quite quickly.
Overall: As I said, I now find it difficult to run without it - it really is my running buddy. A great motivational tool which keeps you going and lets you analayse your runs afterwards.