You gonna be using it in a semi or an MG?
If you have a semi, it's a tossup. If you have an MG and other factory mags, but don't have a drum, I would go for it.
I have both converted drums and stick mags, and use the drums far more often. A full 72 rounds without reloading is great, and a 72-round burst in an SMG is priceless.
A coupla points:
--Some converted Suomis need tuning. I've rebuilt both of mine (and several friends' drums) and they are basic and durable, as long as you have the tension adjusted correctly and they were properly converted.
--Drums are easier to load, and you don't have to worry about them "fountaning" like stick mags will if you bump or drop them.
--Stick mags are faster to load than a drum if you have a good loader like a C3 RapidLoader.
--Drums are MUCH heavier when loaded, and pretty awkward. They definitely affect a gun's handling. Of course, all that weight can actually help you stay on-target! Recoil is minimized.
Hope that helps. Here's my rig, with both types of mags:
[img]http://www.hunt101.com/img/014538.gif[/img]