I still use a guide to cut down sheet goods. Much handier for my
style of work.

The biggest waste of time and money I own is the DeWalt version of the
Rotozip. One of my buddies bought one and convinced me you could use
it for about anything.

Quite the opposite is true. I tried to cut 3/8" plywood with it, and
got smoke with the proper bits. I tried to used it as a laminate
trimmer, and not enough torque. I don't need the mess it makes to cut
a hole or two in sheetrock.

However, it was a Christmas gift, so it is still with us. It sits on
the shelf, unused unopened for about the last 8 - 10 years.

What a waste.

Robert