Very informative technical review MrTeal, Thank you
It is a pleasure to see a review by someone with the expertise able to get into the heart of the beast and make intelligent comments with respect to the build and components used and still be able to reassemble to a functioning unit.
Just one small question from a fellow Canadian, did the unit clear customs duty free?
Trends
The Canadian customs charges are paid automatically by DHL. They collect them from you together with a small broker fee. You can pay that before or at pickup. They got from me customs duty and fees for every piece of hardware coming from SPT (SP10, SP30, RMA components). In order to get something back from them you need to speak with DHL customs and prove that the parts left the country. Then they'll credit the HST on those parts. They'll keep their fee though.
Disclosure: I still run 3 Chili boards (100Gh/s total) designed by MrTeal around the BFL chip

Nice to see a SP20 review from someone who can actually re-engineer the miner if he puts his mind to it.