My FC710 arrived today as well. 30 days since I ordered. Seems it only took that long for the early adopters. Other than the waiting for the mail, I am totally impressed. Mine is almost flawless. One small scratch on the inside of the down stem. Probably from laying in a pile with the rest of the down stems while waiting to be assembled. When I was opening the box I heard some rattling and immediately thought it arrived broken, but then I remembered the ball. HA! That was the rattle I was hearing.
Once I confirmed it was intact, I promptly washed it and filled it and then noticed my EVO was green and ready so I thought ah shit, why not? I tossed a F to F adapter on the top of the FC710 and then proceeded to blow my head off with an absolutely huge flavorful cloud off the first pull. So impressive. The top of the bubbler and mouthpiece tube was flowing with lovely vapor the whole hit. I wasn't expecting it to hit as hard as it did and I didnt really get it for vaping but it definitely will work if you want to give it a try. I may pop my Air on it later to see how it works with it.
Now for it's true purpose... I popped on my dropdown and nail a little later and tried it out that way. Holy cow, flavor. I was blown away. I can't really say much more than others have said about the the way it handles concentrates but it is definitely a must have IMO.
I actually would buy one with a 18mm female joint just for vaping if it was ever offered, just so I wouldn't have to mess with the adapter. And I also agree with
@DieHard about the colored ball. That would be an awesome touch. It would probably be impossible to get the color you wanted though. I'd end up with a pink one with my luck.
Buy it. You know you want it...