Hey Ult. Guitar!

I am considering the purchase of a multi-effects unit for electric guitar.
The two units I am seriously considering are the Boss ME-20, and Boss ME-50.
I havn't been able to find a very good comparison of the two, and was wondering if anybody here could point me the way!

If you think these two units are junk, please let me know if there are any others within the 200-300$ price range that are better!
For $300 you can easily buy a used POD XT ot Gt8. You may even find a POD X3.