I always ware a HRM and, to agree with other posts, you get used to the strap fairly quickly. If you don't set the strap properly before the match, they do tend to slip which means that you either die (according to the HRM which stops reading any heart beats!) or you have to do the hokey-cokey at the next stoppage in play to get it back in the right place.
I agree that you get what you pay for with HRM. I bought a cheap one initially (£20 at Decathalon) and all it did was show my heart rate any any particular stage ... it didn't record the details (i.e. max, min, average) for later analysis.
Personally, I'd go for one of the more expensive Polar HRM (they are only a few match fees!) ... but it depends on what you want from the watch.
I use mine to try and make sure my training is giving me about 60-70% of the work-out from my match (circa 1000-1200 calories a match).
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