As for now, I have the Compact and Original Cabin. For quite some time, I thought, that Cabin Plus was a logical extension to this set, but later I decided to give up this idea. Why? Most of my trips are for max 2 nights, so Cabin is enough. Even for 1 night, I am more than happy with Compact, and especially in the summer, it can handle clothes for 2 nights.
The Cabin Plus is good for like 4-5 nights, which for me, does not happen, almost at all. If I travel for a longer time, I still prefer to have a checked bag, some liquids, etc. And it is very easy to go over the weight limits. And the size may be an issue for some gate agents. Of course, this should not be an issue, when flying business, but some significant parts of my flights are in economy, and - at least for now - I have only silver status. So, at least for me, the Cabin Plus is not a solution.