I've only tested five or six strings so far, but VS850 isn't actually too bad - I've got a set of BG80 baking, and that's not doing well...
Yup, from what I've tried so far, VS850 isn't particularly worse than others...
The tension loss that everyone talks about might only have to do with the feeling of the string going down. Just like how people say Ultimax stops performing after about 1-2 weeks.
Another example that I've mentionned a few times already is how amazing zymax tension retention is according to a lot of people, while it seems normal or even bad to me (looking at frequency readings).
I've just done a racket with VS850 with prestretch ON - let's see how it does. The WISE didn't chatter as much at the end of the pulls, so that's a good sign (but at 32 lb, it very nearly ran out of track).
I updated to the latest version of the Carl Tuner and it does work. Not like before though and not as easy. Now I get a reading on every couple strums but I have to stand the racket vertically next to the phone's microphone, with the head down and just hold the racket cap. I also tried Pano Tuner and that actually worked just like Visor posted. I second Visor's post, skip Carl Tuner and use Pano Tuner. I got same readings on both apps, with Pano Tuner being much easier to use.
I was just going to post how well n track works for iPhone. With ClearTune I wasn't getting great readings so I did a quick search and n track came up. My readings fall right where it should be when looking at previous stats. I prefer hitting the palm of my hand or against a hard object and it gets the same reading as if I would strum it so it works quite well here =D let the monitoring begin!