Instruction: Analyze the user's review text and determine the overall sentiment expressed, then choose the corresponding sentiment option from the provided list (A: very positive, B: positive, C: neutral, D: negative, E: very negative) based on the identified sentiment.

Input:
I've used a Polar A1 basic heart monitor for several months, found it useful for losing weight and gaining fitness, but found myself wishing for something a bit better. Now that I also have the much fancier Polar M61, I'm seeing anew the virtues of simplicity (not to mention low cost.)

Compared to the A1, the M61 usefully adds a stopwatch and regular watch (with either visible along with the current heart rate), and a backlight. It also beeps at you if your heart rate goes above or below a specified target zone. I find all those added features very useful.

Sadly, it is also a far more complex watch to set up and operate than the A1, with many features that no longer seem as important as I once thought. Even so, it still lacks features I'd expected it to include, such as recording the highest and lowest heart rate reached during a session, and a way to record the drop in heart rate during the first minute after ending an exercise session.

I now know I'd have been about as happy with the Polar FS2 model, for half the price, but would still prefer the M61 over all other Polar heart monitors.

P.S. A great guide to effective use of a heart monitor is "Younger Next Year: A Guide to Living Like 50 Until You're 80 and Beyond" by Chris Cowley & Henry S. Lodge, M.D.

Options:
A: very positive
B: positive
C: neutral
D: negative
E: very negative
Answer: B: positive