Barrel, compressed air, maybe a new feedneck [see review], remote line if you are even thinking about going CO2 [not recommended... see review]
Price ~ Performance ratio
Durable (maybe not the trigger).
Easy maintenance - bolt out the back.
Unreliable on CO2 [see review].
feedneck [see review].
I purchased this gun as a backup marker to my Ion which loves to misbehave at the most inopportune times and also to have a 2nd electro to lend to friends who want to come play. The most obvious thing this marker has going for it is its great price - $140 for a high performance electronic marker by Smart Parts makes complaining about the thing difficult. If you are upgrading from a CO2 marker or this is your first paintball marker you will be very happy.
There are a few areas that this marker falls short, but they are easily fixed with after-market purchases if you so chose. In order of severity, here are what I see as the biggest shortcomings of the Vibe after playing with it on and off for 6 months:
1) CO2 performance is spotty at best. The gun will work on CO2, but it will not work well. You will easily be able to cause the Vibe to freeze up by shooting a few strings of quick shots. I first ran my Vibe with a 20oz CO2 directly attached and was appalled to find that a single 10-20 ball burst was usually enough to freeze up the gun due to liquid CO2. I had to pause for about 10 seconds to let the reg warm back up before firing again. Running the Vibe on a remote is not much better, you will get more shots before freezing but continued fire will still freeze up the reg. I highly suggest you run the vibe on compressed air, you will get more consistent velocity and better reliability in-game.
2) The stock barrel of the Ion is too short for most people. Not a lot of elaboration needed here - the barrel is very short [10 inches], not very high quality, and is just not adequate for serious play. Fortunately this is an easy fix - the Vibe takes Ion threaded barrels so pick up a good two-piece Ion barrel off ebay for $20.
3) Last gripe that is easily fixable is the feedneck. The feedneck on the Vibe locks with allen wrenches. That's fine if you leave your hopper attached to your marker at all times, but most like the flexibility to easily remove their hopper between games. If the feedneck is an issue for you buy an after-market clamping neck such a Q-lock.
There are other issues I could point out about the Vibe but let's refer back to my first point about this marker - it's $140. At some point, you get what you pay for. If you need a marker that shoots faster, has better electronics, or more shiny features then you need to look at markers at the true "high end" spectrum of electronic markers.
For most players the Vibe is more than adequate as a reliable, fast, and accurate paintball marker provided you take my advice on compressed air and the barrel. You'll be hard pressed to find a marker less than $200 that out-performs the Vibe.
As a player who uses this as a backup I have to say this marker has performed it's duties admirably. I suspect it will be in my bag for a long time.
First off why would you even put CO2 in that marker and second if you do use CO2 in it I would recommend putting a black heart in it cause then u can change the vibes setting from hpa to CO2 and it will be more efficient