That's true. There are certain times of year when Frank seems more backed up than other times. I usually avoid sending him anything from from November to mid-January, as there seems to be a Christmas-season rush. On the other hand, the work is always high quality and reasonably priced, and I usually have backup equipment.
S.K. Grimes does seem to offer more consistent turnaround times, but prices have gone up since the shop was re-organized by his assistants who took over the business.