The On-Line's design incorporates three basic design features, one of which is performance-related, one of which is convenience-related, and one of which is a little of both.

The performance-related feature is the 365-gram, heel-toe weighted mallet clubhead that features an effective alignment aid, namely a ball-width, horseshoe-shaped opening in the back of the mallet with a "spike" on either side. This design is reminiscent of some recent far-more-expensive Odyssey models and provides excellent stability throughout the swing.

The convenience-related feature is also found in the groove-like opening, which doubles as a great ball-scoop. Mallets are great design innovations, but many of them do not allow you to pick up your ball without bending over. For some of us, that's a pretty nice feature, and the On-Line has the best ball-scooping capability of any putter - the ball never slips out.

Finally, the feature that's a little of both is also contained in the unique opening at the back of the clubhead: At the top of the opening, there are two open lines that match up with the exact equator of the golf ball. If you take a Sharpie and fill in the lines, you have yourself an alignment aid on the ball, too, without having to use yet another gadget to mark your ball.