Q: Now, what kind of company announces an amazing product but does not suggest a price for it?
A: A company who is uncertain of demand and price points
IMHO, Spondoolies has a small number of working prototypes of the SP50 and is trying to figure out how to gear up for production. They may have just barely enough demand from their hosting/merger partners to get production off the ground, and are naturally looking for ways to milk the wider market beyond at the highest price it can bear (with optimists leading the way of course).
This is marginally better than KnC, who's been stuffing every ASIC at hand in their Swedish facility guarded by buxom blondes with machine guns
Technically, I trust Spondoolies to deliver. I have looked at the guts and firmware of all their machines extensively. As an EECS myself, I think their implementation is indeed best in class (better than Bitmain and KNC). One suggestion - do not affix the heatsinks with an epoxy bead (a la SP20).
Economically, I would not pay much more than 1.0-1.2 BTC per TH for ANY new miner. At present BTC rates, this puts the economically feasible price for the SP50 around $25,000 per unit.
Pay more than that, and you are unlikely to see any ROI - which is kinda the point of the whole thing if you are a professional operator with access to low cost electricity.
Everything comes down to price, price, price...