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.