Nice first briskey!!! The sliced shot has some nice moisture showing when I zoomed-in, too...I'll bet it is tender...falling apart under the knife is a good sign, IMHO. Smoke ring isn't everything, either...if electric, won't happen...it's the smoke flavor that counts in the end, though.
Once you get a brisket under your belt, it's hard to refuse the next chance at one...they are versatile in how they can be prepared and finished, and very flavorful.
Enjoy, as I'm sure your will!