They are clearly a first generation design, but the real dilemma is if another generation will be produced in the next few years. I think Avalons are your best bet today, but only if you put them online fast and can recoup the sunk cost in less than 6 months. Otherwise it is quite a risky proposition.

You are betting money on all these things happening simultaneously:
1. Bitcoin price does not tank as a result of panic, regulation, FBI raids etc.
2. Massive ASIC power with cheap energy supply does not come online, destroying your margin
3. Better and more effective ASICs are not produced

I think 1 and 3 are mutually contradictory on the long run, if the price holds you will see much better ASIC designs, there is wide margin for improvement in ASICs.