I've seen and used the v2.5 and 3. I'm sure the WB is a beautiful piece but the NRG seems solid, works well and looks reassuring to boot. My vote goes towards keeping a few bills in your pocket and get the NRG 2.5.
There is a definite difference in quality/feel between the NRG and WB. If you don't know already, NRG is a replica of WB. So of course it's gonna "look" and "feel" cheap. To be honest, though, the NRG does what it does and is a good purchase for people who don't have or want to empty out their wallets. I would recommend you to just keep the NRG since you've already got it.