New to bitcoin mining, so go easy.

Just curious if the S3 is still able to mine bitcoin or is it way out of date (slow)?  Is anyone still using it, and if I were to install one, or maybe two, and left them run for a couple years, do you think it would be worth the initial investment of the units plus say a corsair cx750m power supply and energy costs?

Is there a comparison on cost breakdown of each antminer?

Any recommendations?

Thanks!