How long is a piece of string? LOL
Being an avid Anthem user I will state that its a amazing airbrush, especially for versatility but as mentioned others may not like it..All airbrushes are the same, especially in the mid to top end, in the right hands they all have their strengths and at times weaknesses. I have used an anthem for nearly 12 years exclusively and only stopped using it because it finally needed a new needle LOL..I'm pretty happy with 12 years of use and it has painted anything from the smallest I can do to large murals and never needed to change a thing on it beside PSI. But its a heavier gun and with a 3-1 needle it takes some getting used to and not everyone will succeed with it as a primary gun.
I hate advising to someone "buy this"..Just because it suits me doesn't mean it will suit another and what I may be able to do with it may take someone 12 years to get too because hold any airbrush for long enough and you will learn to make it sing, some can just sing better for some than for others and finding what suits you is as easy as going to a store, a friends place or an introductory Airbrush lesson and ask them to test drive a few..What suits your hand and what you find comfortable is a challenge we all face and mostly find different outcomes on because we are all indeed different...
If though you already have an airbrush, the versatility you may desire is just something opposite to what you already have so you can have the best of both worlds, if ya mainly run gravity, get a siphon and if you mainly have a siphon, get a gravity and that will get you some versatility just due to the nature of each..good luck.