I use amazon reviews as a source for practically everything i buy, therefore if you are like me and chose this route you have probably been led to this product.
This is an accurate monitor, i have compared vs other products of far greater value and they read the same thing.
It is a little over the top with the amount of displays it gives you, if you are monitoring your heart rate then i am sure you dont need 90% of the additional functions, however the timing function comes in handy for HIIT training etc.
The chest strap is actually of descent construction and the battery is very easy to remove/replace therefore you do not drain it rapidly and the fastening points are solid, yet comfortable with no sharp or uncomfortable edges.
Downsides are, it is very cheap looking, especially the strap and clasp pin, very rigid and a moderate degree of difficulty is had in mastering the art of putting on. With wet hands taking it off can be even more of a challenge. However it is also very comfortable and light, which i think is the main point about this item.
If it breaks, gets lost or dies then you will not be much out of pocket, which is a benefit with any piece of sports kit. I have happily used mine 2-3 times a week for the last 3 months and can honestly say i have not regretted buying it and unlike some of my other more expensive sports equipment. It does the job and you do not feel it, which for cardio is exactly what i want.
I would have given it 5 stars if not for the cheap construction but if it was cost vs quality survey it would be 5.
Hope this helps