Only you can decide what is worth it.

The ability to travel out should defiantly improve down wind sailing.

The forward/back ability is mainly used to correctly align your sheet angles and is not adjusted that much (you can move them forward in downwind to help create a fuller jib and towards the sterns for a flatter jib to de-power, but i seldom adjust that).

The main drawback (besides $80) is the addeded deck clutter.