I have the 2's and would really recommend the 4's if budget allows. The latter give you so much more light and are more versatile - if you want to wipe out backgrounds for instance.
I am happy with the 2's (non-fan cooled) but turn the modeling lights off when set-up. I don't like the screw which allows the softbox to be angled - this is easy to strip. Also the largest softbox they can take is a medium 3x4 ft and this is pushing it. They won't take a large. The light quality and controls are excellent.
I would have liked a brighter modeling light 100W is poor. Hensel for instance is 300W+. You need to be able to see what you are doing and bright modeling lights are important.
If I bought again - for long term use - I would go up market to the BX's etc which are made in Switzerland and not India.
Thanks for your comments! The problem with the BX is they are quite a lot more expensive. 
Best regards,
Anton



