What are your guys' thoughts on the Vac n Blo vs. the Master Blaster? I like all the attachments the Vac n Blow has, but it's only 4 HP vs. 8 HP for the MB. I also wonder about something that doubles as a vacuum (dirty air) and a blower (clean air). Any danger of cross-contamination (blower blowing dust on the car)?
I have the 4 HP AirForce Blaster. I use it all the time to dry wheels, hat water out of crevices, etc... You can dry a whole vehicle with it, but its not quick. If your working outside in the sun, you will likely get water spots. If your inside, no problem - but its not a time saver. I believe this has the same performance as the Vac N Blo - or close to it.
That being said I couldn't imagine doing a wash without it. Its the only way to 100% dry a car and get out all the hidden water. It's make wheels so easy to dry, no bending at all.
Recently I've teemed it up with a CR Spotless and solved all my drying problems. Now I take a break while the car drip dries 80% and then get the test off with the blaster. It's a great combo.
One thing nobody mentions is the hose that comes with the AirForce Blaster is too long, too stiff, and cumbersome. Also, the unit tips over on the ground easily, even on the dolly. I've since replaced the hose with a different smaller Metro hose and use it as a hand held. If you get the Vac n Blo, you may want to consider a separate hose for "blowing", as not to blow dirt on the car that's stuck in the vac hose.
Also, mine somehow got a little bent around the collar and started to leak air. Then on off switch broke as well. So when replacing the switch, I sealed all the air leaks up in the unit with silicone. There were many leaks. It looks bad - but works good now.
Replacement hose:
Original hose: