Have an Automag (my mainstay), a Tippmann, a Rebel, and a JT Excellerator
The price. The Redz pack comes in two pieces (the belt and the pack). I think the Redz pack cost $60 total. The Mantis pack was under $30 for everything. Look around you can find it online.
I bought this pack as a birthday present for a friend. It will be better than what he has now (nothing) but this pack does not compare with the Redz Dimension system. Now to be fair the Redz pack costs alot more. Just don't think that you are getting the same quality as Redz for a cheaper price. There is no comparison between the Redz pack and this one. Maybe the pro pack is a closer match.
The pack is fine (especially for the price). Many reviews on this site, however, make it seem like you are getting a pack as good as Redz for a fraction of the price. Don't be fooled. There is no comparison the Dimension series blows this pack away. It is, however, a reasonable good pack for the price. I'd give like to give it a score of 7.5 but since I can't be that specific I'll go with 8.