Plugger's shafts are some of the best. I really like his shaft locks that really stiffen the whole deal. No wobble and no sticking or breaking like the cam locks that are usually used.
Joe is one stand up guy who is good to deal with. He has quality products that I highly recommend.
I prefer the behind the elbow mount as it balances out the whole detector. I also like it in the water as it takes the control pod and battery out of the swing area making it easier to swing in the water and keeps the whole detector out of the way of the scoop.
But I also sort of like the chest mount idea. Makes swinging much easier especially in the water.
The History Channel recently had a show about several pirate ships that were sunk on purpose to prevent other ships from entering a bay on one of the islands where the pirates were active. Lots of neat stuff being found like cannons, cannon balls, pottery, full capped bottles and even gold coins. The detector of choice by the folks doing the recovery were Minelab Excalibur II's. That tells you a lot!