Don't do it!!!!! GSA job is very stressful and underpaid. TPS is n09 and GSA n07 so you will lose at least 50 cents pay! I highly recommend you dont.
Not where I work. GSA gets more than TPS. And I want to do this because my ETL HR said that I would be most suited to the front or HR and said that really the only way I would get leadership experience necessary to become a TL is through GSA.
Also, the ETL AP at the store where I will be interviewing said that there will be some movement in GSTLS in the coming months. She said this in such a way as to suggest that if I do well as a GSA I can go up.
TPS is also very stressful. Believe me.