An alternative to the MLD Serenity is the GoLite Shangri-La 1 Nest. There are a few considerations to think about:
1. It is almost 2x heavier than the MLD, lists at 15 oz. If you aren't packing your hammock gear, that's not bad, but with your hammock stuff, the weight might matter.
2. The floor is/should be more waterproof than a silnylon floor, and less slippery, so you might even be able to leave behind a ground cloth in some situations.
3. At campmor right now (and other places online), it is $65.00. This is the main reason I bought one to pair with a Gossamer Gear SpinnTwinn, as sometimes I have to balance budget and weight.
Just to note, I would have no reservations about getting anything from MLD. Great stuff — the Exodus is my favorite pack!