I am new to XM. I cannot speak to the other options you are considering but I just purchased the Delphi MyFi unit 2 weeks ago. It is very easy to use and transfer from office/home to car. For the gym it would work fine as long as you are listening to the 5 hours of recorded music feature. As to the sound quality, it is certainly not CD quality. If you are used to hi end sound you will be a little disappointed. I was. My retailer (not a big box outlet) who I trust said that XM does have a little better bandwidth than Sirius. The other issue for me is reception. For home/office use, the antennae must face out a window to the south. That was a bit of an issue for me. Also, the antennae for the car seems less effective than the antennae for the office. Fidelity seems to be a bit worse for the car than the office as well. For me, I'm still happy with my unit as I was looking for continuous music for my midfi office system plus the portability for the car on long trips etc.
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