It's clopyralid + florasulam + fluroxypyr. On that basis it should be good on thistles & docks. Not sure what florasulam brings to the party other than chickweed.
florasulam often works in cooler conditions. That is why Starane XL (fluroxypyr + florasulam) is so good on cleavers whenever you apply it. Although to be fair, straight fluroxypyr applied at the right time will kill cleavers.
I think next year you could do with 3/4 rate PDM as a pre-em first, you don't really want a crop becoming that dirty in all honesty.
How much did it work out at in terms of cost? Some callisto and bromoxynil would have scorched that fat hen to zip in two days.
I would normally go with a pre-em but we hadn't had any rain for 4 weeks prior to drilling and none until a week post drilling, making pre-em a waste of money.
Will let you know cost later.