It's actually pretty interesting, you can estimate your position in the order queue based on their BTC address.
https://blockchain.info/address/1QB8Ds5KbGYBLQa5RyDQ2sVUeSKWf7qgkZYou can see 55 transactions of 2.4BTC into it on the 11th from the last sale.
After the increase, there was a bunch of transactions for multiples of 2.65 (and what I believe to be a 4 part transaction for 31.8 or 12 units), totaling 31 (+12) for a total of 43 units at 2.65.
You then see the big increase after the price drop, at this time 81 multiples of 2.2 (plus one of 3.3 without a corresponding 1.1). There's two transactions of 22BTC that could be 500 U1 orders or 10 S1 orders, and of course small orders could make up a single 22BTC U1 order, though I think it's unlikely that someone who paid in multiple transactions would do it in exact multiples of 2.2 If I had to guess, I'd say at this point they've sold 61 S1s and 1000 U1s since the price drop.
looks like they have 479 orders paid for based on todays spike BTC received (695 at time of this post ).