I'll just make a direct comparison Pros: Super high quality ATC, Realistic routing/procedures, frequencies found on the real charts - so you'll call clearance for clearance, not the overlying ARTCC, staffed from 8am-11pm Pacific time Cons: Small area of operation... socal only with one exception - service at KSFO if going to socal, typically only 2-3 people working all positions... so to separate it from my above statement, you still use all the freqs you would in real life, but one physical person might work clearance, ground and tower - while someone else would work approach/dep and enroute... IE- you'll hear the same person sometimes along most of your flight. However in the real world you get a bit of that too - some sectors are combined with mult frequencies. And I don't think the cost is a con - it takes people to staff this sort of operation, but I think its 15-20 USD/month after your trial period expires.