I would append a results may vary note, as I would with any of the scanners on a market. Performance for a simulcast site is hardly consistent in its own coverage area, let alone take into account the many different systems across the country. I've seen/heard it go both ways with these line of scanners.
I'm going my my personal experience in Macomb County, Michigan, where it's been known to be one of the worst simulcast problems ever. We have nine towers in close proximity, and no other Uniden, or GRE scanner, has been able to over come it. A few of my buddies within the County have also experienced 100% satisfaction with the PRO-651 & PRO-652 scanners.
Besides, there's no risk. Unlike other scanner stores, Radio Shack has a generous return/refund policy, if you don't like it.