I just bought mine less than a month ago and my ultraguage blue would read an average of 8.2 (0-60) / 16.5 (1/4mile) in stock form. Just the base tune (first tune provided) from BNR, using EFI live, quickened it a bit. Now the ultraguage reads and average of 7.1 (0-60) / 15.4 (1/4mile). I've tried it 3 times already. That's with a K&N drop-in filter for the only physical mod. You will not regret a tune. I love the increase in power and drive ability very much. It's a whole new car at lower rpms! Now, I've got the ZZP catless downpipe on top of the tool box just waiting for BNR to provide a tune revision so I can run it with full potential. Just be willing to be patient, no matter who you choose. I think the companies, that tune the Cruze platform, are also busy tuning a lot of other platforms as well. I usually have to wait one complete week for an email response, but the responses have always been professional, informative, and productive.