So, I was using/testing these at the time when I downloaded the Weiss:
Waves 1st DeEsser (Really good on tracks)
Waves Ren DeEsser (Good for certain freq's focus - just a little artifact'ish)
Scheps Omni (Incredible as it has 2 DeEssers and they work really well, just the Sonnox sounds clearer/cleaner)
Fabfilter DS (Really good but not as clear as Sonnox)
Lindell 902 DeEsser (Was OK)
PSP Infinite DeEsser (Was OK)
Soothe (Can get artifact'ish)
SPL (Not that great)
IK T-Racks Multi-Band DeEsser (Cool Multi-band if needed)
Pulsar 8200 (Really incredible but I needed more control - the sound is great though but you have to be careful)