I find, personally, that both Fitness Rx and M+F Hers are extremely poorly written and too much into blatantly pushing supplements from companies that are obviously sponsoring them. I have a subscription to Fitness Rx, but won't be renewing it or even likely picking up another issue off the newstand.
I've had a subscription to Oxygen for the past year and have enjoyed it, but don't really feel they offer much new each issue - pretty much if you've read three issues, they've covered everything they're ever going to cover. That being said, if you're looking for some comprehensive workouts to try, they do that well. And yes, Oxygen is a Tosca vehicle, being married to the publisher helps, I guess.
I have subscriptions to Women's Health and Fitness magazines as well, and won't be renewing those either. Too much fluff about clothes and makeup and the models have no muscles.
Currently I've been reading Runner's World a lot and love this magazine, but of course, it's geared to runners, not lifters. I'm considering getting OnFitness.