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I am using the factory bases on my 93 in .22 win mag. I have a set of basic weaver rings with a 3-9X40 Vortex Crossfire scope on it. I have not had any problems so far.
Mine is chambered in .17 hmr with a similar 4-12 vortex scope on it. It shoots ridiculously good! It would never be any better with another set of bases, thats for sure.
I had some issues with mine, with standard rings I could not get the side focus on my scope to work as it was binding.
Changed scope to an AO and rings to burris sigs, couldn't bore sight my scope so i switched them front to back and turned both around. It worked to center my scope and it shoots great.
I think they are okay if mounted right, but a nice 1 piece would be better.