These are minor but daily annoyances on tour.
As supplied, my front rack is Thorn, my rear rack is the narrow Tubus, whatever it's called (Vega Evo?)
The front Thorn rack is excellent - solid as a rock but not heavy. BUT despite it being so large, there is actually very little area where I can put on my pannier clips, mainly due to the diagonal bar fouling the cam-closing Arkle clip. I've had to move the clips in to the point that the clip-clip distance is only about a third of the pannier width. So while the rack is solid as a rock, my front panniers aren't.
Secondly, the lowest horizontal bar, where I hook the pannier's elastic stabiliser, is a convex curve. This means that the hook isn't very secure - it can slide off.
The rear Tubus rack isn't Thorn's problem, but they did sell it to me. While it does have a narrow slot near the bottom of each side, this slot is too small and the wrong shape to fit the hook on the pannier's elastic stabiliser. There is nowhere else to put the hook. I tried jamming it up the open bottom of a tube, but it didn't really fit and the tube was damaged.
So I don't use the stabiliser, which makes for bouncing pannier syndrome on rough roads. Yes, I will cobble together a Heath-Robertson fix for this. It's just gobsmacking that Tubus' design is so poor.
Other than this it's an excellent rack, and the narrowness is not a problem for carrying a tent, which wedges nicely between the panniers.