I've learned it's better to pick them a little early and then let them ripen off the vine. They taste the best when they are a deep purple but that is also when they are the least firm. All the deep purple ones I end up eating straight from the vine instead of saving. It quite a task to keep searching daily for new berries that are ripe. They hide pretty well and my vine is well over 20ft long climbing up a staircase. No complaints by me though.
Backyard garden blog from my personal garden in Cardiff By the Sea California. I grow a variety of fruits and vegetables organically.