I have a couple of GGG strains going right now. Got them as clones from a friend. Sugartown Express and Grape Puff (2 phenos).
The buds on the Sugartown are on the small side. Yield is meh. Quality is good, not great. Keep in mind that I'm a huge snob when it comes to genetics, so when I say something is "good", it's usually pretty damn good by most people's standards. Through trial and error I found out that this strain needs to be pruned extensively. Otherwise, you end up with a bunch of dinky buds that are a pain in the ass to trim. I'm on my second run with it now, and it definitely looks better than the first run. The buds are more well formed, but the top colas are still not what I would call big. I'm on the fence as to whether I will keep this strain, or not. I almost always give a strain 2 chances though, so maybe everything will come together this time. The yield still isn't going to be that great, but I'm a quality over quantity type so lower yield isn't necessarily a deal breaker. If I can get at least 2.5 oz's per plant I will probably hold onto it and grow 1-2 for variety. It looks done at 8 weeks, but I will probably let it go 60 days.
The two Grape Puff phenos are not that similar which leads me to believe that only one of them is actually Grape Puff, though I could be wrong. I got the clones from a space cadet, so it's possible that he fucked up the labeling. Pheno #1 is slightly tall, but not overly lanky. VERY fragrant smell. Lots of crystals. The buds are not very dense, but they get pretty big. This is only my second time through with it, but the first time it didn't seem to be quite as good as it looked. The awesome fragrance also didn't equate to great taste which was disappointing. Taste is VERY important to me. The yield was awesome though. 4-5 oz plants. Still, if the quality and taste doesn't improve this time I will probably get rid of it.
Now, the second pheno, on the other hand, is quite impressive. Similar in height to the one that I just described. The smell is nothing like the first pheno and it's not as pungent in general. The buds are tighter with a high calyx/leaf raito. The crystals are not as big or as numerous as the first pheno. However, the taste is MUCH better, and the high is also superior. It might even be the best strain that I have at the moment, but it depends on who you ask. This is also my second time around with it. Good yield on this one as well. Around 4 oz's per plant. It trims easily as well which is nice.
I wish I could get my hands on the Grape Stomper, but I haven't been able to find it.