the weight of the MB200 is approx 230g, together with the D200 at 830g with 2 EL-EN3e (can use one EL-EN3e also) at 80g each... which means, its already >1.2kg without lens (additional 350g if u have attached the SB800)... spoken to someone using a d200 (tried with my MB200) with 70-200mm VR f2.8, the whole feel he got was its more balanced compared to just d200 alone.
in general, the only thing i dun like abt the mb 200 is that my thumb can't reach the multi selector if i m using it in "portrait" mode... the thing i like abt it is, its AA size compatible! Unlike D70, when u encounter battery flat, u can still purchase and use CR2 battery using the MS-D70 battery pack. for D200 alone, i think got no solution other than bringing along the battery charger and start charging the EL-EN3e when ur battery is flat. with the MB200, u can purchase AA size battery easily... no fear of battery issue.