BMR I was talking to Dylan the other day and he said the same thing - heavy first cut alfalfa that was lodged and twisted up was the only thing his Rowse double 9 has had trouble with.
As for mole hills, where we are in southern BC there just isn't the equipment available. It would cost me a fortune to buy and ship in some specially designed levelling implement and I haven't found anyone that has already done so. I will be floating it with whatever I can rig up with scrap pipe or rail irons and harrows. It's not that I'm trying to avoid dealing with the bumps and rocks, they will get levelled. The real appeal to me of the double 9 sickle mower is laying down 18' in one pass and knowing it's going to cure in way less time than my discbine windrows. We had a forecast change here in 24 hours and were scrambling to finish baling last night. Good thing since we woke up to socked in rain this morning and now the forecast says rain all week.
Being able to get it knocked down is one thing, having it cured, raked, baled and shedded in 3-4 days after is another.