Best 8-bit Atari disk drive? 810, 1050, XF551

It appears to me that the 810 with an MPI mechanism is the winner.  I say MPI mech because I think most 810's with the Tandem mech ultimately suffer the dreaded pin failure and the door ends up in your hand.  Their fate was probably to the trash in the 1990's.  The 810 was still solid, but few knew how to fix them.  The 810 with MPI is truely a tank.  That's probably why they are still showing up on Ebay some 30+ years later.  Yes, there are lots of 1050's on Ebay, and it's a fine machine as well,  but I don't think they are as robust as the MPI 810's.  It's probably a close call between the 810 MPI and the 1050, but I'm a little biased to the 810 since it was my first Atari disk drive.  Bought one (Tandem) in 1983 for $475.  Yes, the door came off in my hand in the late 80's, but I knew a guy who had the new replacement parts.  I probably owned 4 MPI 810's and they all worked great.

The 810 was SS/SD, but does anyone know of another SS/SD drive.  I think everyone else had started with SS/DD (Apple, Tandy)?  Anyway, I've had 1050's that have failed me, but never an 810.  For me, the 810 is as iconic as the original 800.  Stout, but beautifully engineered machines that last over the years.  As they say, they sure don't make'em like that anymore.  The only benifit I ever found to the Tandem mech 810 was you could attach tape to the disk and jiggle it while writing to make a bad sector on purpose.  I want an 810 for some reason and I don't know why other than pure nostalgia.