Just keep in mind, VS pumps are electronic in nature, and the electronic components of VS pumps are VERY expensive: lose them, and you might as well replace the whole pump. If you are in an area where thunderstorms (and the electrical surges from lightning) are rare, this may not be a big issue.

But 2-speed pumps plus electromechanical timers are a much more reliable option in lightning prone areas, like south Florida. I'm not sure whether south Texas is more like California or Florida.