Then why are you asking about the computer program?
I was just going off the fact that the computer program package is like $409... if you were even considering paying that you'd be wasting your money because of the relatively close pricepoint of the golden standard.
If you want a cheap meter then buy the cheap meter. Some will tell you to get it, so will tell you not to. Ypu've already got people telling you it's louder than the TL, and some telling you it's not as loud as the TL.
What you should be inquiring about in your specific instance is it's consistency. It already appears that it's not consistant to other meters, but you need to find out if it's consistant with it's self, i.e. if multiple measurements lend the same result.