fyi- i didn't actually use an opg order for 23k shrs (might be obvious that is too much size for this stock), i worked into it during the premkt and for about 2 min after the open, then reported my avg price. Yes, i did have a nice profit for awhile, but I thought (wrongly) that the stock could go down another buck or two, so i ended up with a loss.
Also, many times i do opg orders and accept the mkt price (just wasnt the case on pot), but the size has to be pretty small so in the event i get screwed on the print it's not a huge deal.