The Pro-651 scanner has very good audio and dead simple to program. One of them going to keep. Doubt RadioShack will keep up with the firmware updates, with current track record. They don't even have a suitable link for the software needed on the SD card for the Pro-668. So if you don't have a backup, or erase the card by mistake, or gets corrupted, You have to hope someone else have a backup and put a link for download, if you didn't do a backup. What kills me is they are still asking retail for it with pretty much no support? You figure they would dump the rest of them at a reasonable discount and just do away with it and call it discontinued?
Yeah, I wasn't able to load the software from the SD card in the Pro-668 I got. I found a link for the program and drivers in the forums and used that to download them to the laptop. Once I did that I was able to get things working. I have a copy of my SD contents on both another SD card and on my laptop.
If RS doesn't plan to provide support for their branded scanners then they might as well do all a favor and close out what stock they have and just get out of the scanner business.