I much prefer it, but I tow. I don't know that it would necessarily be worth the cost if you're usually running around empty. A new vacuum booster is a good bit cheaper.
I wonder if it can even be done on the van chassis. My vac booster is impossible the get, since it seems like I bought the last one in the US. It's using one that was only on vans and only for 84, 85, and 86. Maybe if I could swap in a newer brake pedal assembly something for 87-91 would fit. It has to do with the linkage on the booster vs the brake pedal connection.