If the 4500 is anything like the 9200 then this may answer your question.
I have a 9200HD and I personally don't like the Pansat motor control setup menu, the box seems to drive a motor well but fine tuning the motor position is crude. Blind scan works very well but it too will miss one or two on ocassion. I personally like the Captive Works 600 premium for finding sat positions because it has the auto position mode and stops when it finds the active TP on the target satellite but this box is discontinued and I'm not recommending it because blind scan doesn't work period. Then I highly recommend the Coolsat line of stb's for both motor control and blind scan features, I have a CS 6100p and simply love it, many other Coolsat owners will testify of their models as being a preference above other brands. Also consider if a HD stb is in your best interest, SD stb's will soon be a relic in this new age technology and if you have a HD TV then go with a HD stb. So it would be wise to read reviews on the various brands and make your descision but compare all reviews of each model, not all reviews are equal. you may find contradicting info and misprints are common when shopping for receivers. Do your homework before buying. This is my opinion for what it's worth. Good luck