The Cilo gear suspension gives you 4 choices.
Choice 1: Nothing. Light and flexible, but no weight transfer. Difficult to get weight off of your shoulders.
Choice 2: Foam pad. Somewhat better than nothing, but foam doesn't have much longitudinal strength. It bends quite easily, so weight transfer is modest at best. With very careful packing and compression, you can use the load to make up for this weakness, but it's not an ideal solution.
Choice 3: Frame sheet. The frame sheet provides excellent weight transfer. However, it weighs over a pound. Also, the stiff plastic inhibits the pack from flexing with your back and conforming to your back as you climb. So, you get weight transfer, but at the expense of weight and climbing performance.
Choice 4: New Klymit inflatable pad. I have one, but haven't tested it yet. No idea how well it will work. It might be great. It might not.
Compare this with the frame in the Hyperlite. The frame consists of a very light and thin pad that is there solely for comfort, not for load support. The pad is thin and flexible, so it doesn't keep the pack from conforming to your back and twisting and flexing when you twist and flex. This padding is coupled with two thin aluminum stays. They provide excellent longitudinal support, which allows for great weight transfer to the hipbelt. However, because there are just two stays, and not a big stiff plastic sheet, the frame doesn't keep the pack from moving, flexing, and twisting along with your body. It's just a better design. It's lighter, more comfortable, and interferes less with your body's movements and balance.
I have a Cilo Gear pack. I like it when used with just the pad. However, I really don't like the frame sheet. I think that using the frame sheet gives up too much in terms of weight and climbing performance. As a result, when used in my preferred configuration, load carrying performance is somewhat compromised. The Hyperlight carries loads well, and climbs well, and is lighter. As a result, my Cilo is getting less use, and the Hyperlite more.
I agree with you on the removable lid/expansion issues. The ideal pack would be a Cilo Gear pack with a Hyperlite frame. The Hyperlite is also a little on the small side. It's a "small" 39 liters, while the Cilo is a "large" 45 liters. You have to really pare things down to the minimum to fit a multi-day winter climbing load into the Hyperlite.