Strengths: It does almost everything you could want.....
Weaknesses: when it works.
Overall: I have had mine for 12 months and it has been a great aid. However, the HRM has never really worked, incorrect readings due to trees or buildings are worse than none at all. It needs more work on its robustness, the HRM and the GPS receiver. Still love it though.
Overall: I avoid aspartame, full stop. Therefore I no longer buy Lucozade. I prefer to make my own sports drinks, after all, why do all that exercise only to pollute your body with all sorts of nasties?