Model Power N scale turnouts.....

Ive recently run across a couple online ads for N scale Model Power dual radius curved turnouts and double slip switches for reasonable prices. Are they any good? More problems than they’re worth? I know they are likely to be far from the best, but are they THAT bad?

Also, they were listed as either R1&2 or R3&4 radii. What do they translate to in Inches?

I could really use a double slip for the transition between main and staging, but my budget will not remotely take a $70-$80 hit for a Peco double slip, so I’m hoping the Model Power’s are good enough to get by.