I currently am running Xpress Pro HD (5.2.4) and am having no troubles with it, but have purchased the boxed version of Media Composer 3.0 and am anxious to get it up and running.  However, I have several ongoing projects and fear down time if I install the upgrade.

What are the chances of running into problems with installation?

If there are problems, how much of a hassle is it to step back?

Is the program different enough that it will slow me down?

Somebody alleviate my fears! 

joelrmorgan:

What are the chances of running into problems with installation?

 What are the chances of you getting hit by a car crossing the street? There's always a chance.

joelrmorgan:

If there are problems, how much of a hassle is it to step back?

 Uninstall 3.x and reinstall 5.2.4. Your dongle is backwards compatible.

joelrmorgan:

Is the program different enough that it will slow me down?

 Nope. Same application, more stable, a few added features.