I own a Nord Electro 4 HP. I love it, play it daily, and gig many weekends. Pros: This is a beautiful, high quality hand made instrument which weighs only 24 lbs. Effect and EQ controls are easy to reach and never buried in submenus. The Hammond B3 voice is killer. There are several wonderful piano voices. There are hundreds of additional beautiful voices created by Nord or its users and distributed for free. There is a robust user community and forum for support and new voices. You get excellent support from Nord.
Cons: This instrument is not multi timbral. You can only use one voice at a time. It is expensive.
This is a highly portable performers' instrument with outstanding sound.
I was very impressed with the Nord Electro 4 series. Incredible acoustic piano samples, access to the full Nord Sample Library for free, and a killer B3 emulation. Sounds like a no brainer, right? Well, think again. Look at the price tag and then one little detail: the Nord Electro 4 series offer all the specs above but in a mono-timbral keyboard. Considering the price, you'd better wait until Nord realizes that if they want to practice these prices and compete against the likes of Korg, Roland, Yamaha, etc. they'd better beef up their Nord Electro implementation with multi-timbrality. The Nord Stage 2 already has that, but at a prohibitive price. It would be nice to get an after-touch sensitive keyboard (especially when you're buying the HP version) and modulation+pitch wheels, please?