Because of back problem, I am planning to buy one of the guitars supports below:
a. ErgoPlay Tappert Classical Guitar Support (http://tinyurl.com/luhjbwo)
b. A-Frame Guitar Support (Link: http://tinyurl.com/nqfr9sq)
c. Dynarette Guitar Cushion (http://tinyurl.com/os75rr4)
Has anybody purchased one of those guitar supports? Any recommendation?