Most of the good points have already been mentioned. I can't stress enough the point about it being fun. It's one thing to go out, buy the best equipment, and perform well. However, it's another to be a star using less paint, air, and firepower. It's the purist's form of paintball.
The markers are also quite awesome. For the most part all pumps are extremely
easy to deal with. Most will blow Tippmann's supposed reliability these days out of the water. I would even go so far to say as they make Automags seem like high-maintenance markers. They can run on CO2, HPA, and even liquid CO2 from a siphon tank with very good consistency. They are also the most air efficient markers you will ever come across. On top of that a lot of pump markers are pretty old. It looks good on yourself to show up with a marker that's older than a half of the people playing that day. It shows you have a history of the sport, and the markers themselves are pretty stylish too. While other markers are considered dated and old after a few years, pumps never lose their value. For the most part they all come with excellent features too - there's rarely a need to upgrade/modify a pump marker. CCI, Lapco, and Palmer's markers come with some of the best barrels in the industry.
Compared to a lot of markers coming out these days many pumps definitely are smaller - the popular CCI Phantom for example. For some you can never have too small of a marker. However, Sheridan based markers and WGP "Snipers" are just as big and heavy as many markers made today. At the same time they make a lot of marker's with "tough" images like the plentiful 98 Customs, A-5s, and X7s seem cheap and flimsy. The build quality of most pump markers (especially brass pumps) is very satisfying. Who cares if you can eliminate twice as many people when you are having 3x the fun?
This post has been edited by Piller: 04 August 2008 - 11:46 PM