Although I wasn't supposed to keep any grapes from this first year, I kept them on three of the vines. I was warned that they may put the vine under stress, since they are so young. I did notice two of them looking a little stressed, and the grapes were pretty dark and sweet, so I decided to have my first harvest. The third vine which held a grape is doing great, and is actually the only bottom 24 vine that will reach the top wire, once I get them in.
I also spotted some plump caterpillars hanging around. Gotta watch out for those, as they tend to blend in pretty well.