Just a century day ride, but I took full waterproofs, flask of coffee, and food, + tools/inner tube etc. as it was meant to be a a really bad weather day.
It handles really well, as far as I could tell it didn't make a massive different to the bike (apart from downhill speed, wind resistance from the bags) but then I didn't have a huge amount of weight in them. Still got to get the better half to sign off on letting me do a touring holiday as I need to buy a new light weight tent for it (my last one - a Marmot Nutshell - started leaking really badly through the floor and got thrown away in the end).