Konova has one of the most popular roller bearing sliders on the market, and has now made available their new K5 slider which is a slightly larger version. The larger bearings and slightly larger carrier answers the call for supporting heavier payloads. Hopefully I should have a video review of this unit up soon, but i'm just getting back from CES Las Vegas. You can find more images comparing the new K5 against the smaller K3 slider over at the new listing (click here).
Konova New K5 Slider - Larger Bearing