Originally Posted by RJman
There's a danger with a hinged tree that the fit may be imprecise. However, a good bespoke shoe tree or a good EG hinged lasted tree will fit inside with enough snugness to keep the leather taut. I find that some sprung trees stretch the leather, which in a shoe like a loafer is particularly bad for the fit. Church's sold me trees that were very tautly sprung -- stretched loafers out badly. Bad Church's!
I agree with the RJman on this.
When purchasing sprung trees - I usually go down a size or so from what my shoe size would indicate. Trees are still snug enough to do the job but no stretching.