I found a friend who doesn't pay for his power to host my S1
I don't know if the upgrade kit is worth it, being only marginally cheaper than the full deal.
Depends on how many you'd need I guess is the question. When talking about 1, 2, heck even 5 it's not much, but in a case like ours it was a $3k difference by buying the upgrade kits as opposed to the full units. And, we get the benefit of having the S1's continuing to hash until they're delivered.