I tried a flight from this brewer. The best beer they had was the sour brown ale, it started with just enough sourness to pucker my lips and finished off as a great brown ale. The worst was their wit, it tasted like a hotdog.
A friend of mine made an extract banana bread beer, which is my favorite extract brew so far. My favorite extract I brewed though is the northern brewer breakfast stout kit.
From my experience there is not much visual activity after the krosen drops. But do not fret the yeast are still active and your beer will turn put fine. If you want to make sure fermentation is happening just take gravity readings.