Yep, all solid. Picked up a top box from chap off ebay last night and took it to work today all laoded up. All fine, no problems.
Dunno why, but I'm now really struggling to get the bike up on centre stand. Dunno if the little extra weight of top box on back is causing it, but really struggled this morning, with all my weight on stand lever! Never had trouble getting it on stand with same luggage in panniers on back... Weird!