I had used MCPatcher to improve graphics on the 147 version.

I have downloaded the version for 1.5 but when I test it I get a Bad Login error.

Is this something that is ok for me to use?

Do you guys use anything similar?

The problem only happened in the TEST section of the patcher. Onc patched it works ok.

Well, I've always stuck to Optifine, since it doesn't require anything external.