i tried the speed feed for a while on my trimmer. i don't see what all the hype is about. it's just as easy to use the regular spools to me.
i do have a speed feed that came on my echo 58v battery trimmer that i use at home though.
on my husqvarna i just went back to the husqvarna head. it takes more time to pull the string off the spool and cut it than it does to wrap it around the spool and put it back on.
when i use the speed feed the trimmer line likes to get wrapped around my arm in the process.
I tried putting my husky head back on my 430lst the other day. My complaint with the husky head has always been, and still is that it lets out too much line. Any of them, I’ve go the T25, T35 & T35X. I use no guard so when it lets out too much I had to stop and wind it back a couple turns.
Speed feed is better in my opinion, not because of the manner of loading it, I used red Mac and old style echo heads for years as well as the huskys. None are too difficult or time consuming to load. But the speed feed holds a lot, is lighter (which lets it spin faster) and in my 5th year of use I haven’t had one fail. And yes of course they are easy to load.