Yes, they've worked well for me. You can mount them round the other way if that's what you prefer - I think I decided on narrow end at the back because it makes the lids flatter on the bike.
The lids snap down nicely, provided you don't over-stuff the cases - the great thing [compared to the soft bags I used to use] is clicking them off the bike at the end of the day with a turn of the key and walking inside with them. They have speed and load warnings from the manufacturer, so there are limits to what they can do, but for a couple of nights away, they've been great. Waterproof, reasonable unobtrusive on the bike, keep the weight nice and low...all good!