I'm back.
After processing many hours of VHS and VHS-C tapes with the ADS Pyro Link I recently purchased on EBAY, I found that the Pyro had trouble with tapes recorded in EP or LP mode. There were instances of drop outs throughout the recordings -- short instances of time were missing -- even though dropped frames were not reported. I was constantly trying to find the best tracking setting. When using the Diamond VC500, there were no drop outs. Whatever glitch there was in the tape, the Diamond didn't drop a beat -- the glitch was recorded, but time wasn't missing.
I also discovered that when using the Diamond VC500 with composite, that to remove the "wiggles", toggle between S-Video and Composite mode in the capture software before recording. That seems to properly reset the Diamond for composite mode and gets rid of the "wiggles." You can definitely see a difference in the left and right borders, and the overall image looks stable. Well, you may have a different experience, but give it a try. I was using Magix Video Pro X (v.11).
Also, I believe in Windows 10 you don't need to install the driver that comes with the Diamond, I think Windows will install a Diamond driver signed by Microsoft.