Strengths: When it's working well, the 301 gives you pretty much everything you could need from distance, pace and average HR, right through to the ability to upload specific workouts and race against your 'virtual partner'. The latest firmware offers a multi-sport facility enabling you to switch from bike to run during multi-discipline events. Finally, being able to download your runs to Training Centre package and review what you did a year ago is really useful for me - as I'm training for FLM for the second time and can compare what I was doing a year ago with the same part of my training now.
Weaknesses: Mainly to do with the technology. Main reservation is the fact they've put everything into a box smaller than 10 fags (ok - I know no-one on this site knows how big that is but go with it...) means the antenna is a bit unreliable under trees - whic means that when you download your run back to Memory Map or something similar you may find you ran down the middle of the canal for a while. Similarly the HR monitor can be a bit flaky - HUGE spikes and simply losing the signal completely at times. Finally, the Training Centre software could do with a couple of minor tweaks - such as you can graph virtually anything agains time OR distance, but not at the same time - I'd sometimes like to know what time I hit the 5k mark (or the 7.5k etc) and what pace I was running - you can't do this in the current version.
Overall: A fantastic bit of kit that enables insights into your training and racing that has to be useful - my pace judgement is now far more accurate (and that's without the 301 on as well as with it), and as a result my times have come down to levels I'd only dreamt of before.
If the new version, the 305, has sorted out the minor gripes with reception and the HRM, then I really can't imagine a better tool for improving your running, cycling and triathlon performance (well, short of losing a stone and running a bit quicker!).
'A GREAT ROUNDUP OF THE GREATS - AND A BGR TO BOOT!'
Strengths: As a lakelander by upbringing, and a fell runner now and again, I loved it - and the stuff about the Bob Graham round was brilliant.
Overall: Having supported a mate on his third (and successful) Bob Graham attempt I can appreciate the obsession that goes along with this particular piece of idiocy. I also know some of the characters mentioned from various races - a great book.