Back in 2008 or so when I first tried them, I found they were about on par with Abena X-plus 4's for capacity and wicking. That still seems to be true today. They're safe for maby 3-4 wettings overnight. Not enough for me nowadays, unless I know I'm not going to be drinking much before bed. They're comfy and thickness is moderate for daytime wear. Not a lot of swell when wet.
Nowadays there are many more options for higher capacity avaialble from brands like Tykables, Rearz, ABU, etc, if that's what you're looking for.
Bambino has improved upon the design though. They've had their Bellissimo out for some time now, which has more sap for improved capacity. Very recently they've released an upgraded all-over-print classico that has greatly improved capacity and swells quite a bit when wet, while retaining the good wicking. I think those would be enough for the majority of users for overnight wear.