I recently bought a bluetooth HRM for what I thought was a bargain price of £25 on eBay. It pairs up with Strava on Android nicely, but it's frustratingly sporadic. It'll maintain a signal for a period of time, then magically stop transmitting without warning, then when you go to analyse any rides, it looks like you've died for a large portion of time.
I ride with my phone in my jersey pocket, and tend to ride on feel, only looking at the data afterwards. I previously used a Garmin 410 with HRM (hangover from running days), but it's only suitable for short stints as the battery dies after 3-4 hours of activity.
Has anyone on the forum similar experiences with bluetooth, or solutions (buying a Garmin 510 or similar is out of the question at the minute)?