I an anxiously awaiting my 2nd Berney Brothers saddle. Tom is very, very knowledgeable and willing to answer any and all questions you may have. You should always feel free to ask anyone as many questions as you'd like before you purchase something from them.
Not to derail the read, but does anyone know how wide their wide tree is? I'm looking at a used Prix T, and they dont have any measurements online.
I own 2 BB Dublin Jumpers that run narrow. The M is like an NM in other brands. The girl I bought it from had a TBX for whos was too wide, but it fits my smaller built TBs. I also have a W which is more like an M--narrower than my Niderseuss M (which is toward a MW), fit my broader TBs. Both of mine are also better for more curved backs.
I believe when I made the tree observation in the past that some disagreed, though, so YMMV.