Vue6 is not slower than Vue5 on anything I've done OK, I use the infinity versions so I can't tell you what the lower versions are like.

No you don't have to buy extra render engines for poser. But with Vue7 you have to buy the rendering network separate. They have pretty much out priced the average user unless you want to downgrade. But Vue 6 and up uses poser to pose and can use the poser shader tree. So Vue has it's advantages for poser users.

Now P8 has been a improvement over rendering. The upgrade price to P8 is the same price for P6 as it it is for P7. So you really can't go wrong with that. Then the upgrade to Pro2010 would not be as steep.

No matter what complaining you here, P8 has been the most stable version I have had out of the box, P4/5/6/7/Pro since P4 and I got P4 when it was it's full updated version. It's the same as all software. There will be some system setups/machines that will have problems. But the majority don't have those problems. The few are just more vocal.