I had a Vis-Tec tail light modulator on my ST, it worked fine and installation was plug-n-play. I've have used Hyperlites on several other bike.
Hyperlites bring additional LEDs and increased visibility over the stock taillight, and they would be my 1st choice for that reason. But there is something to be said for the ease of installation, plug-N-play, of viz-tec.
Paul