Subject: message subject think getting a 1 . 95 % rate is impossible ? think again ! we can offer you the absolute rock - bottom lowest rate , guaranteed . we work with all credit types . visit our site now , for your rate quote . click here now ! now that i have had both services , and having noticed that a google search yields no definitive answers for people , i wanted to post my personal review of the two systems . i have an alpine cda - 7878 and an alpine xm unit and a panasonic sirius unit , both with terk antennas . the alpine unit was connected to the head unit via an ainet cable and the sirius unit was connected with an auxiliary rca adapter available from alpine ( kca - 121 b ) . i had xm since it debuted and sirius for a few months in the pacific northwest . the bottom line , for those needing a quick answer , is sirius is superior in sound quality , features ( free streaming from their website ! ) , and channel quality ( better music , no commercials , better talk ) . xm has a few more channels that make very little difference to the end result ( read on ) . after careful review of both systems , sirius came out the winnner , as i have said . the channels are laid out well , lack commercials , sound great , and are streamed on the internet . the only disadvantage of sirius was its oft - sited lack of nascar , which they seem to be trying to remedy . also , xm has an extra comedy channel ( it ' s boring , and features older , censored comedy ) , and a few more " experimental " music channels which most will find totally useless . surfing xm for music is often like surfing the regular ( terrestrial ) radio in a large city - you get nothing but frustration . it ' s no wonder xm doesn ' t stream live on the net so that you can try before you buy . also , xm ' s channel layout was unfriendly , in my opinion . the greatest and most dizzying drawback in comparing the two , however , are the staggeringly stupid and annoying xm commercials . not necessarily the corporate commercials that come from outside companies ( which are annoying in an expected way ) , but the ridiculous and loud in - house xm stuff that makes you have to turn down your radio really quick when you ' ve had it up loud - especially with the windows open ( yes , they are that embarrassing ) . this , and the better performance of sirius , was the deciding factor in my cancelling xm . xm , however , holds their own and can satisfy a customer with some decent music and a fair selection of talk . if not for sirius , i would have kept xm , i think ; probably because it is nice to listen to the same station no matter where you go . yet , as is the way of competition , sirius has offered everything good that xm does and done it right . sirius outshines in the talk category , with a variety of right and left - wing shows , all of the useful talk channels xm has , and npr , pri , and a well laid - out channel plan . xm does a bit better in the design of their customer care website . sirius also has a customer care website , but it is not as robust ( less detail ) . however , xm doesn ' t have streaming audio on its website - apparently we all have to pay xm $ 6 . 99 extra in additon to buying another $ 200 receiver for the house . in addition to the crappy commercials , this is probably where the corporate influence of xm being part - owned by clearchannel and gm shows .