I did back when they charged appropriate rates.
Typically the service was a brief affair (some exceptions), but from memory I think I always left satisfied.
For the price they charged, that was good enough for me.
Those prices are long gone now however. I don't see the point in dropping the same price I'd spend on a well reviewed escort, as I would on a no-reviews-allowed escort.
Basically, conveyor belt service is just fine, PROVIDED they charge conveyor belt prices.
Smart girls are the ones who know what they deliver and charge accordingly.
That feeling of having overpaid just leaves a bad taste in my mouth when leaving, in much the same way as escorts don't like undercharging clients for what they feel they're giving them.