Hey all,
I have an old Trenton made ACME anvil, around 190 lbs. I like it, but having used a couple of German double horn anvils, I like those a lot better. I really like the flat horn for doing isolated work, and the hardy/ pritchel placement is handy IMO.
The only advantage to a London pattern I can think of is the step, and that can be easily remedied by a hardy block (which most people have) or a swage block (which not everyone has).
So, what style do you prefer and why?