Personally dont think you can compare a V1 with the new infinity both in hardware and software. When i looked into swapping out my older haltec, to get some more functionality, i narrowed it down to MS3PRO and infinity. By all accounts they both do great but at the time when i was looking MS didnt have full safeties, so i got a great deal on an infinity. Now MS has updated their safeties so its a good option, also huge following and the forums are really well sorted for information and diagnosing any problems.
I am pretty damn happy with my infinity though. My cars never driven so well.
I had the infinity driving withing 2hrs of finishing the wire up, boosting in 2 days and fully tuned in less than a week just driving to work. They've made it very easy for the end user. Even managed to output speed to my digi dash from the infinity using an LX450 speed sensor, which hasn't worked in forever due to speedo cable issues.