Yes do it.
Because of the design of our home we'd run a good half gallon of lukewarm water from the hot faucet at the kitchen sink before it was hot enough to do the dishes by hand. We'd also run it again before starting the dish washer so that the water coming in to the dishwasher would be hot from the start. Little to any noticeable cost increase in electricity to continually circulate hot water through the line throughout the house....we have the circulation on a timer...It starts at 7am and stops at 8pm.
Just eliminating the frustration of waiting for the hot water to come was worth the price of the install.
You'll need to have an electrician install an outlet over your hot water heater...and a plumber will install the pump there as well.
We used Mike Hayes for the electrical...forget which plumber we used, they provided the circulator
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