Quoted from pinballholder:
Mine is hard, can go a few games and miss it every time. But I wouldn't say it requires a perfect shot.
Quoted from Matt_Rasmussen:
Mine is a tough shot too, takes a well timed flip to get it up and all the way around. Should be a tough shot for what you get rewarded with by hitting it.
Thanks for the verification guys. I have Whirlwind sitting next to my Funhouse, and it's so much easier to make the cellar shot on FH than it is to make the WW ramp. I can hit the cellar all day long and twice on Sundays!