MaxiMarcianoI own a Metro Datavac and can vouch that it is very powerful. It comes with all sorts of attachments and gets every nook and cranny clean in my PC. It's fairly loud though and shouldn't be used for long periods at a time.
All I've ever heard about the canless air one is that it isn't powerful enough. I think they have a more powerful industrial version of it available, but it costs an arm and a leg. The Metro is plug in which is a better option since you don't have to deal with recharging a battery.
MaxiMarcianoYea, we picked up one of the blue special edition ones at work and it's a steaming pile of crap. It's obnoxiously loud and it performs nowhere near as well as canned air.
All I've ever heard about the canless air one is that it isn't powerful enough. I think they have a more powerful industrial version of it available, but it costs an arm and a leg. The Metro is plug in which is a better option since you don't have to deal with recharging a battery.