The clock loses time? Thats strange as the clock should be fully electronic, it shouldn't loose time...
As for Sat. radio I have XM in my Lexus and my son had Sirius installed in his. I almost like the programming of the Sirius more. You'll love the sat. radio, its all I ever listen to anymore. They have dedicated Washington DC area traffic and weather, always updated and you don't have to wait, and every kind of music, news, sports, comedy you can think of, both XM and Sirius. Like 4.6 I do miss the local news sometimes and the DJs that pop in (they do on satellite too depending on what station you're listening to) but its a tradeoff. Only problem is my house is in a really wooded area and I usually have to switch to FM about 3 miles away because the signal starts dropping in and out. Other than that though reception is great, only drops out in parking garages and under the heavy steel gas station rooves.
Get it you wont be dissapointed.