It's funny to me so many have "failed". I've four different guys and myself using both saws with flippy caps and regular ones, in four years of using them commercially, saws seeing at least 30-35 hours a week six days a week, we have had one flippy cap fail and one regular old style on a 660 get cracked by a guy cranking down on it with a sqrench.
My guys like the flippy caps, sure in four years we have one or two cases were they didn't get put in correctly and had a little gas or oil on the leg. I'd for sure rather have the flippy's than the screw in like on the 346, with such shallow slots it you over tighten the cap the slots are so shallow the sqrench will bugger the hell out of the slot.
To pass up on such a legend as the 440 over flippy caps is just absurd. I've got two 044's that get the fire used out of them, one of the best if not the best firewood saw made. I like the ported 460, but the 044/440 is one sweet saw. I'll take the flippy caps any day, most days we burn three to five gallons of mix, those flippys get used many times filling up. I guess my 9 and 10 dollar an hour employees, just ole farm boys are smart enough to know how to use them. The one that failed was replaced for free. Same with our lawn service, our blowers and string trimmers have them too., never and issue.