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I think modern bagman models (bagmen?) have fixed most of the weaknesses.
Mates that have the SQR for commuting duty seem to like it, with two minor reservations: with long use it can start to rub/wear the back of the bag, and to get the bag on/off it needs to pivot slightly so it drops, which means it may not work for small frames with not much seatpost showing.
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I use one nearly everyday, SQR slim. It's ace.
I'm 178cm and have a normal amount of seat post, only minor issue I've had is taking it off with mudguards when it's full and heavy. If you ain't careful it'll bash your guard.I've not tried any other version, or any other bag with it, so can't help there.
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As with @AWu-Tang and @Lolo, really like it. Have an SQR plus standard saddlebag on my Brompton, never really big loads but it’s been solid. No movement at all and minimal impact on bike feel, although admit I’m not out the saddle much.
Only downside is that it’ll never look brilliant, you do need a fair bit of seatpost (and I’d be cautious on carbon), and the SQR rack that affixes to the bag is a bit of a pain when not mounted.
That bottom one looks like it's missing an attachment point somewhere? (Or is it upside down and the rubber-wrapped bits are meant to rest against the seatstays?)
The seatstay-clamped ones are meant to be ok with not too big loads, though I'd pad the clamps somehow. Some more pics of various saddlebag support types at: http://pardo.net/bike/pic/fail-035/000.html