I am another that is no longer a Monroe fan, I fear they may be living off the reputation. Gabriel another old brand was worse. Bilstein did good for me the last time. For GM, actually AC delco is pretty decent. But brands change all the time, depending on who bought who. so it is kind of a crap shoot. Ask the counter people.
A cheap strut spring compressor is not a good idea. Many auto parts stores rent professional quality compressors if you buy the parts there, a deposit refunded when the tool is returned.