I have used the Senior reamer, the Pipnet, the Castleford, as well as individual Danish made steel reamers. I prefer the Pipnet and the Danish made steel reamers. The Castleford is a cheap Chinese knockoff of the Pipnet and the quality of the one that I bought was awful. Too late I discovered that there was a burr on the cutting edge which gouged the interior of the chamber. Into the trash went the Castleford. If your chamber is conical, you need to work very carefully to avoid gouging the briar. With a conical bowl I use several sizes of reamer and then use emery paper to sand off the ridge between the reamers. What I really need is a good conical reamer. With certain odd shaped chambers I use emery wrapped around a shaped piece of dowel.