I have a friend who owns one. I think it's a great design idea, the exteriors can be very atttractive and it's not very heavy for the carrying capacity. That said the interior finish (Some kind of thin, glued-on cloth with a matte surface) quickly gets to look scuffed up and cannot be easily cleaned or replaced. Additionally there is no way to reconfigure the interiors, (I.E. Changing the ratio of butts to shafts, allowing more room for accessories etc.) which would be possible with a little design work to the foam inserts that hold the cues themselves removable.
Finally the other thing that concerns me is the single-skin ABS plastic shell itself. I can find no information on impact testing of this. Does anyone regularly put one of these cases into airline luggage holds? Does it hold up to that kind of treatment?