I have a Nord Electro 2. It's an awesome board, but you have to know what kind of keyboard you are looking for.
The Electro is not a synthesizer. But is is really great for what it is made for: It emulates electro-mechanical keyboards, which means, that it emulates Hammond B3, Rhodes, Wurlitzer and Clavinet sounds. Nothing else - besides the acoustic piano, which is more like a bonusfeature, which you can use just in case.
It has very cool built-in effects like wah-wah chorus and overdrive, but no reverb, so you have to add an outboard reverb-effect if you want some room around the sounds.
I use it together with my Kurzweil K2500X.
Who needs a signature anyway??