I did and I personally would/have spent more for a quality one. Yes it costs more but it's worth it, even used. I wanted more in the end than Rev9 can provide as far as a quality tone and exotic sound, unless you want ear bleeding of non-res tps and tomei or something.
Depending on your needs or situation there is nothing wrong with Rev9, it beats stock most definitely.
My thoughts initially
Exhaust guidance
Very identical CBE and my thoughts after a few
DNA Motoring Exhaust- after a month's use