We reviewed the Sony NEX-VG30. The NEX-VG30 is a significant improvement over the NEX-VG10 that we tested previously. We did not test the VG20, but it's safe to say that the differences are smaller, with the main one being the new support for motorized zoom lenses.
Slow computer got you down? Maybe a hardware upgrade should be in your cards, if so this guide to the Fundamentals of Upgrading a PC is an invaluable read. PCSTATS Tips