This unit weighs 160 pounds, so I'm thinking it's not going to be really portable for most folks.
When you choose a compressor, it's a good idea to figure out the CFM needed to run the tools you'll be using.
This compressor puts out 5 CFM at 90 PSI. (It's a good idea to have more CFM than the minimum you need to get the best performance from your tools). A more portable Rolair unit with 6.5 CFM at 90 PSI is VT25BIG. It's still a hefty 108 pounds, but the way the cart is set up should make it easier to move on stairs. This unit will run quieter than cheap consumer-grade units.
Both units would be suited for professional work, and should give you a long service life. Our customers have been very happy with this model's performance and the brand overall.
If you need a very quiet unit; you may want to check out California Air Tools' CAT-10020C. It puts out 5.3 CFM at 90 PSI, and is the quietest unit we know of.