Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Be careful if you are short

Intrigued by this product I had a lengthy chat with a Gaiam representative because I am short (5'2") and not very heavy, and wanted it as a desk chair. I was assured that staff at Gaiam of my size used the chair at their desks and were comfortable. I bought it and after a short period am looking for a replacement. Even propping the "balance ball" up with a firm pillow underneath (an unsightly solution that needs constant adjustment) my hands are still too low for comfortable use of my computer keyboard. Might be ok if you are around 5'5" or higher, but if you are small, I definitely advise against this for a functional chair requiring access to desk-high functions, and I believe Giaim ought to say something about this in their ads and through their phone reps.