As Mark pointed out there are many machines from the same base machine just with minor differences. First thing is you want a company that has good customer relations who will help if things are not right. Then learn from other peoples experiences and there are plenty of them on these forums.
As for my experience, well I got it sort of right, would I have made the same decision in hindsight, no. So have you owned and used one before, or at least used one? Looking at that Charnwood it is similar to the Record PT107 except that it looks back to front and has the same fence arrangement as well.
Now it has the same blade adjustment method as the Record PT107 which is in my opinion a real pain to set the three knives accurately which is why I said I would not have made my purchase decision if I had known about this. There is a solution but it initially cost £187 for the new holders but the blades are cheaper and reversable at £28 for three but setting blades is now just a case of fitting with no setup so all three are at an identical height.
So taking this into account are you happy with the blade setting and have the space for the two swing out tables. The SD31 has same blades but better for the table lift or you could look at machines with a spiral cutter block which get some good reviews.