Yep, 18" rollers can save a ton of time...
personally I prefer the plastic/metal adjustable "Wide Boy" (not sure if I got the product name correct) 18" handle instead of the non-adjustable plastic "Big Ben" 18" handle.
I also really like the trough-style bucket they offer, and yes, you can get a lid for it. I really didn't like the "Big Ben" 18" tray at all.
But the real trick can be finding quality 18" sleeves... if you're lucky, your local dealer that stocks the handles will also have a good selection of sleeves. Alas, around here I can only get 18" x 3/8" nap sleeves on a consistent basis - and as every single building within a few hundred miles of me has textured walls, I rarely use a 3/8" nap sleeve here.