It looks pretty perect and there are no disadvantages? it looks to good to be true
It works as advertised and there are no blockchain bloating or future scalability issues like with other solutions.
At this point there is a 10DRK limit on the darksend function , this will be lifted with the release of RC4.
the only issue as I see it at this juncture is that from an investors stand point DRK is already relatively expensive.
Once the RC4 release is out merchant adoption will become vital.
however as DRK is forked directly off the BTC main trunk all the merchant APIs are compatible with BTC so its a trivial matter for any merchant currently accepting BTC to implement DRK as a payment option.
As far as I am aware none of the other competing anonymous coins share this API compatibility.