I've broken two trunions on my 550. Both replaced immediately (and for free) by Dillon.
And this was just in normal sizing of well lubed .308 military brass.
Others have reported braking the link arms, but mine have held up just fine.
Have not used this press mounted Swage It, so just my opinion based on the above -that I wouldn't want to put that much strain on the 550.
My other big concern is that the swaging process is supported only by the rim of the case. Have seen plenty of variations in brass strength in that area.
I have run many (many!) thousands of rounds through the Dillon 600 Primer Pocket Swager (which supports the case head internally on a rod), without a single problem.