I have one of the mass models from Amazon, and I really only use it in acute, centralized situations (i.e. calf or hamstring strain). I have tried it for back and glute problems before and hated it. The intensity (however low) was too much for me given the size and connectedness of those muscles.
1) foam roller daily
2) compression boots 3 to 5 times per week
3) percussion massager as needed
4) TENS if nothing else helps