I got this email from General tools In Adelaide a H&F reseller, it may be of interest to you.
Hi Mark
Thank you for your enquiry. The Optimum range of machines has only just been released (as a replacement for the Sieg range), and while we have received a BF-16A into our showroom (which looks like a very good build), we have not yet seen a BF-20LV in the flesh. I have checked stock around the country, and there are now no Sieg Super X3's left (there are a couple of standard X3's in Sydney and one on display in Melbourne).
The X3's are very nice machines. Well put together for precise work but not heavy duty as they only have a 3/4HP motor. The BF-20LV seems like it would be a bit more robust with a 1.13HP motor (Face Milling Capacities are X3 50mm and BF-20LV 63mm). The X3 has a fixed head, while the BF-20LV tilts 90 degrees left and right, which is a must for milling in my opinion. Travels are similar, though the X3 has a bit more vertical. Both machines are, however, for light work like model engineering. If you are looking for a "workshop" machine you should consider the HM46 or HM-48.
Best regards
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Darren Redman
Sales & Marketing Manager