I also own a Peterson V-SAM in addition to the iStrobosoft. I often dreaded carrying along the extra case with my tuner when my hands were already full with a guitar and other equipment. This app helped consolidate by placing the highly accurate tuner that I have come to trust right on my phone. I am especially fond of the extra visual add-ons which allows me to see why my strings sound dead at times. Who would have thought that my overtones were out of tune with the principal note which was making me sound bad? Very nicely done!
Thorcom about iStroboSoft, v2.3