Hi everyone. I bought an M22 in the end and I sussed it out after about a week, well not so much the HRM but how to use it! But odd thing was after my run on Saturday, suddenly the dislay went funny and it lost the time and the calories etc., for that workout, (but kept my totals), and the time and zones reset themselves (I obviously pressed a wrong button). It works fine now that I've done another workout since, but at first I thought I'd broken it. I must say it doesn't work well on the treadmill and it must get some interference from the machine, although it still works out my average etc. Works perfectly outside though and gives me an idea about my pace.