Hi Shutler, well done and hope you're enjoying your new steed.

I've got the Honda inner bags and yes they are steep at £100* a pair, but then the shape of the panniers is slightly odd (aerodynamic). (* I got mine free with a voucher!)
They are quick and handy for getting in and out of the original panniers, but being an odd shape this can be tricky actually fitting stuff in the bags, they're not enormous. The very nature of having inner bags thus reduces the carrying capacity of said panniers. Before I got the bags I used to remove the panniers and stuff everything in before remounting. This worked fine, as laying them down facilitated easy access but then carrying them loaded, without banging into hotel fire doorways or the like, was tricky too! I've got the larger top box but never got around to an inner bag there, because I manage to get everything into the side panniers. I use the top box mainly for holding two full face helmets. I've also got the elasticated straps that hold these bags, or other stuff in, if not using the inner bags, they are again expensive (free again) but do a good job when used as they were intended.
I dare say someone will recommend something similar or easily adaptable. Good luck.
