I nearly bought one of these a couple of years ago, but was also committed to viewing an M300 the following day.
Passed on the Harrrison, and when I phoned back, the Willson had just gone.
I ended up with a Warco GH1330, after waiting/searching for a further 12 months, newer prettier, and probably more versatile overall, particularly in terms of speed range.
Still regret missing the Willson though, immense capacity for it's footprint.
Have you got the fixed steady to go with it?
Bill