I only wash my dog every few weeks. She gets stinky from swimming in a pond at doggy day camp! I don't wash my bike much either, but when I do I'd like an easier way to dry it, especially the areas you can't get very well with towels. As far as water getting into electrical, that's pretty unlikely. Bikes are made so they can be ridden in the rain and are waterproofed. These dryers are not strong enough to blow water past seals and o-rings.
As far as the shop vac - I have one where the top comes off and acts as a blower, but it's not very effective as a bike dryer. I used someone's portable
Airforce Sidekick at the MAM and it did a fairly nice job. No water spots. That's what got me on this kick.
My golden retriever actually likes the hair dryer on it's lowest setting, but that's not very effective. Her long thick hair takes hours to dry. Maybe I'll just get the dryer without heat, or not use the heat.
So, I guess nobody has any experience with this company... (so far)
EDIT: - OK, it's not really heated air - "Remember that you are drying water on a painted surface. An excessive amount of heat will not be a good thing for your expensive paint. The heat we gain comes only from the electric motor as the air passes over the motor before exiting the blower tube and nozzle. We do not use an auxiliary heater since this could cause the paint to bubble and damage. The 25 degree increase of air is from ambient temperature. If you are drying in the winter in 40F temperature, then you can expect about 65F coming out of the nozzle. Please allow 5 or so minutes for the motor to heat up and warm the air."