Same same (pro D Magnet). The only time I switch putters is when I'm driving or doing upshots . At that point, I pull a FLX Challenger. I will say that the Magnet's knack for going over things (jump putt or elevator) is what made me choose it as my primary putter in the first place.
This guy knows what he is talking about!!!! Its all up to the person though and I pesonally use all my putters depending on wind conditions and length of the shot. I tend to use my black DX Aviar for longer jumpers. I have canned more inside of 60' with my 5X JK Pro Aviar than my with my Champion Rhyno. A local pro at my course absolutely tears it up on jumpers with his Gateway Wizards in different stages of beatness.
I find that a lot of people--including top pros--like a bit less stable putter for most jump putts, which also seems to match what Sean said for straddles as well. Thus, for jump putts I pull out a fairly beat XD that I've had for some time because it holds a line well and won't hyzer out too early. I'll bump it up to a bit more stable (newer) XD when it's windy.