Nothing major - great quality, good capacity, tough (except for the pouches, which take the hit when the bike goes down - both of mine are now ripped).....

- I take my panniers off/put on regularly, when I'm staying in hostels etc. The need to strap them securely to the bike every morning is time consuming and fiddly. (A minor adjustment to this, making it easier to thread the horizontal straps behind the pouches and thus negating the need to unpack them, would be straight forward if I had an industrial sowing machine re-sow the pouches through the kevlar material - but I don't.)

- The top velcro straps are not well designed. Fine tuning the length of the straps when the panniers are on the bike is very awkward, but necessary to maintain a good fit as the volume of your stuff in the pannier changes day by day. I plan to improve on this by fitting new straps using a metal friction buckle, which will help so long as the buckle is able to remain secure. The Ten adds an additional inconvenience in the pillion handles - you can't simply adjust the straps to the correct length and then sling the bags over / lift off, as you have to feed through the pillion handles.

- When the bags are very full and thus 'deeper', they don't hang vertically but overhang outwards (does that make sense?!). I could rectify this by extending the depth of my frame to provide greater back support, but would prefer not to - more weight. (When the panniers are 3/4 full they hang better.)

- Not so easy to secure small roll bags etc on the top of the panniers, when extra load capacity is needed.

- And the inner WP bags are not so well designed - very sturdy, but there is too much bulk around the top section, which takes up space and prevents a really watertight seal. And when they are really cold, they stiffen up and become more unwieldy.

I reckon Siskiyous will solve all of this: quick to attach / detach at the pillion pegs; simple to sling over and lift off (hence the question about pillion handles); no adjusting of straps to fine tune the fit: they are designed to allow you to strap items to the top when you need more capacity; and it seems they are pretty waterproof (I'd back up clothes etc with additional WP stuffsacks). And I like the asymetric design to shift the weight a little further forward. After using a GL tank bag, I am confident they will be very well made and tough.

Of course, until I try them I won't know their flaws!! Such is life.

But like I said, the Magadans are good bags and could be improved with a few minor changes. Perhaps Adv Spec will amend for the Mk2s.