Need Some Recommendation as I am Beginner

[allguitar101]

[FONT=&quot]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: [/FONT][FONT=&quot][FONT=&quot]http://tinyurl.com/nqfr9sq[/FONT][/FONT][FONT=&quot])

c. Dynarette Guitar Cushion (http://tinyurl.com/os75rr4)

Has anybody purchased one of those guitar supports? Any recommendation?[/FONT]