definately...
I have two spare markers.
For the most part I use the Bush2k for everything, with my evo-esq minicocker as a backup and the shocker as a lat resort. But... If it's a Rec day, or I feel like a change, I'll take out the cocker.
Also, I can use the Shocker if I am forced to play back or I want to scare people with a marker that looks like a brick with a barrel stuck on it.
That said, I love all three of my markers, it's just that they have different styles and you have to change your outlook on how you play depending on which one you use.
Wookie