I just got my Bag Boy Volt about 2 weeks ago. I was able to play 1 round with it before it started snowing again here in CO. The user features (phone holder, remote holder both inside and out, drink holder etc) are well designed. I had a Bat Caddy prior and one of the things I noticed was the center of gravity is WAY better on the Bag Boy Volt, I don't think the 4th wheel even touched the ground and there are some hills on my course. Can't wait to play with it more but for the 1st round, very impressed.
@skidawg79 Thanks for sharing, that is awesome to hear. I agree it is a much better design than many I've tried. I think the placement of the battery is a big part of the center of gravity you mentioned.