I can't vouch for Celtic Croft, but my husband has a pair of piper brogues from Scotweb and he thinks they are more comfortable than his regular dress shoes and has worn them 3 days in a row all day before.

The footbed is glued in but could probably be pried out fairly easily (I've done this with my sneakers as I usually wear out the inside and replace it with a Dr. Scholl's gel pad)

You could probably even get said gel pad in the shoe without taking out the original bed.

It does have a low arch built in.

--Chelsea McMurdo--