I have an Inventum HRM with chest band, I like it. It works but it's pretty basic. That said - it was only 29 Euro so I don't mind. Inventum is a brand over here - sort of cool gadgets and things that work well but is more of a C or B brand. Apparently a Dutch brand?
As for FitBit - I have one and I love it for things like walking and monitoring activity during the day. It's not a HRM but does take your weight and calculate cals based on weight, age and activity. As for accuracy with walking - I must say that I've been pretty impressed with it's +/- 5% accuracy (ok - sometimes +/- 10%) with distances walked and stairs climbed. If i don't have my GPS available on my phone - I use the distance from it.
If you are wanting a simple reliable activity/step monitor then you could do a lot worse. And at 99 USD a pop - not bad. They also offer a web site to track food and things. I used it for a while and think that Spark could benefit from looking at it - and even incorporating FitBit...
For the technically minded - FitBit has an API that you can use to access the data in the FitBit and use it to populate your own tables.This can be extended to a web application (like Spark). Something to think about.
Speaking of which - is there a forum or mail for improvement suggestions for Spark?
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