You only pay $0.113/kWh in TX?
If you're looking at it from a purely financial standpoint, I wouldn't think $6/month would be worth the hassle factor.
It seems that one of the most important variables in the "is it financially worth it?" calculation is the expected annual increase in the price of power. I don't know how accurate 4.8% is. If the reality is 10%, solar will be great. If the reality is 0%, solar will be lousy.
If you love the environment, it looks like solar will save you a few bucks and help slow the rate of global warming, so why not?
With such a small savings, though, I'd be tempted to wait and see if the price of solar drops more. If you wait two years, could you double your savings? up to you. For most people I know in CA, going solar is a clear financial win and a clear environmental win, so I encourage everyone here to do it.