just wondering if anyone has a dev 5 cam pakage and what they think of it, ive heard that it has "backlash issues" which im not sure what that means.
one guy has told me that its the best out there and hes had no troubles, but ive heard so much negative feedback about the dev 5 and jmm in general.
what do you guys think?

JMM are pretty good to deal with (in my opinion). Yes, they are a bit dearer than most other aftermarket companys, but that's because they have actually done plenty of R&D and they will actually show you the results that can be had out of each package, rather than going off word of mouth.

I have a DEV3HL cam. That combined with the minor intake mods of the package gave me an extra 20rwk, which I was very impressed with.

Either way, speak to plenty of people (including the Alted guys, as well as JMM) to make sure you get what you really want.