That is right in line with what they charge around here. $200 for the 300 and $399 for the 550. I would have them do it, if it were up to me. I bought mine off Ebay and had a buddy that installs viper's all day-every day put it in for me for $100. It can be done yourself, but what happened in mine is he has done so many and does them so fast he happened to short it out and fry it. He just tossed in another one from the shop and sent my back for replacement. If I would have done something like that I would be out the $150 I paid for the 550. make sense? I have a window module here I have to put in too so I can't tell you how hard that is yet.