Its alright...

I would have rather paid $1 instead of $2. I decided to download this and test it to compare against the various free calculators you can use online with your computer (some also get more extensive than this app).

One thing I would notice right off the bat are the anti-roll settings and the spring/damper settings. The anti-roll is lax and with RWD will throw your tail out more than the online ones which produce a tighter feel. Also the spring/damper adjustments dont really match (if you know how to calculate the math) and the online calculators are actually closer.

Convenient for on the go tuning (like at a friends house) but the adjustments could be a bit more accurate/better in making a base tune.

The BDS about ForzaTune 4