If you have access to the old monster builder use it. It's still very functional at building and upgrading monsters. I still use it. IF they can get the online tool to that point it will become functional (that and if we can export to RTF!)
I do have the old offline monster builder, and find that for solos or changes to monsters, I use that instead of the online one. Plus, I can pack an entire encounter series together onto one Word document and cut & paste an RTF, reformat a bit and save a ton of paper.