[Scan-DC] Radio Shack PRO-651 versus PRO-668

[Blair Thompson]

Who has thoughts on a comparison of the two? 

http://www.radioshack.com/radioshack-pro-651-handheld-radio-scanner/2000651.html

and

http://www.radioshack.com/radioshack-pro-668-handheld-iscan-digital-trunking-scanner/2000668.html

Either one is nicely priced right now, so the cost is not a factor.

Even though I have in the past observed the policy that "you can never have too many radios," I do have a lot of analog scanners sitting around that don't see much use. I don't need another paperweight, so I want to get one or the other and be done with it.

The PRO-668 decodes systems that elude the PRO-651, so that in itself might be the deciding factor. As well, the PRO-651 doesn't come with the power supply. I have enough wall warts that I can find one that fits, but it certainly is nice to able to charge the PRO-668 via a USB port. 

Will there be an issue with firmware upgrades for the PRO-668? I can find several online reviews for the PRO-651, but not for the PRO-668.

I live in Alexandria and work in DC. Encryption could leave either one obsolete soon, but there's not much I can do about that. I listen to trains and a few airplanes, and whatever else that needs to be heard.

Please let me know what you think: the good, the bad, and the ugly of each one.

Thank you.
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