Hands-down, the single best improvement I ever made to my former boat Boomarang. If I had it to do over again, I would, only sooner. I was single-handed 90% of the time and it wasn't easy to quickly go from the pilothouse, down to the main cabin, up to the cockpit and then step onto the side decks to handle lines or fend off a tricky approach. While the W30 does handle well, it does not pivot around its full-length keel like a sailboat around a fin keel. The bow thruster virtually eliminated the need to back and fill in tight quarters. For me, the thruster and the autopilot made the boat a true joy to own and operate.
As for the price, if it were a brand new installation, I would easily pay close to the retail value of the thruster. If an older, quality installation, maybe half that.