Purchased some in April for the new RT LC, two side and one large top box liners, used them for six weeks (in a K1600) I wanted soft expandable liners and not the rigid (BMW) type. They don't really look much for the money, then again they are just bags, however these are manufactured from top quality materials, very light, extremely well made and very, very strong! Better still, when filled, they fitted perfectly filling the entire panniers with no gaps!
Whilst away I filled these bags daily, expanding them to their maximum capacity (and beyond) purposely to test them and in particular the zips, as from experience it's often the zips that go first. If you do fill them to capacity you will have to lean/push against the side pannier lids to make them close, not an issue (I never realised just how robust the RT / K16 panniers are!)
They are real easy to carry, load and unload. Indeed you will be the envy of the majority of other bikers, especially on ferries, where you will unload or load in seconds, allowing ample time to sit back and watch side show, as the majority of other bikers sweat and struggle.
No, they're not cheap, but as with most things, you get what you pay for. Having used and tested them to their limits I would highly recommend this brand of pannier liner.