Instruction: Given the user's review, identify the user's sentiment from the listed options. Answer using one of the options.

Input:
the ab-wheel is very light and can feel very "plasticky" but it totally gets the job done. For the price (< $10), it's totally worth it. Best of all, you get the work out you want with it... a few reps and you immediately feel the ab core burn. However, i always feel that i'm not using this device correctly because i keep suspecting my posture. Having an experienced gym coach watch over you a couple of times to get the right form would go a long way to ensure you don't injure yourself and keep getting a good work out.

assembly and use instructions were lucid and helpful.

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