The thing with the R55 is the old world charm. It feels like a rifle that was built about 50 years ago. Before aluminum alloys and composites made up the bulk of a rifle. It's the type of rifle that appeals to someone who wants something that's very accurate right out of the box (Some reports have put many of them on the same accuracy level as higher end bolt guns, This could just be internet talk though). This is also the rifle for the person who wants a semi auto, but predominately has Annies, coopers, Kimber, Remington target bolts actions etc. They're the ones these rifles are aimed at. The kids will overlook this rifle. The guys who have the above guns will recognize what it is.
That being said there are a few quality parts that I prefer on my 597 TVP. I like the engraved Remington logo on the heel of the pistol grip, VS the plastic T/C cap on the R-55. I also like the rubber recoil pad. While not necessary it is a nice touch. The one on the R55 is plastic. It's a shame. Because those are the only two flaws I could find with the R55.
I should also add that both the 597 and R55 have last shot bolt hold open mechanisms. The lack of this on the 10/22 is probably it's biggest short coming.
If it's a one or the other choice (You're only fooling yourself if you think you'll only be getting one

). Then I'd also have to say the 597 is better bang for the buck. Plus with it's popularity I'm sure there will be a lot of mods for them in the near future.
Until I shoot it and check out reliability/accuracy compared to my 10/22 target I can only state my general observations and the pros/cons that are on paper. If mine is a jam-o-matic (I have read the stickies, I'll loosen the guide rods before trying it out) or broad side of the barn accurate then the 10/22 will be a much better deal.
On paper the 597 target (get a bull barrel, it might be a while before you change out barrels) is the better buy.