...oh absolutely. Because the ride is stiffer, there's less body roll. If you roll mainly street but still want the lifted look the spacers are the way to go, in my opinion. It's practical. BUT keep in mind, if you have a sagging rear prior to the spacers, they won't fix that. All the spacers do is raise the vehicle, so if your rear sags say about a half inch, after your install the spacers and give them time to settle, your going to have a lifted vehicle with a half inch sagging rear.
With that said, IF you have a sagging rear and are looking into the daystar spacers, it may be a good idea to check out Toytec lifts because they offer the front spacer and rear replacement coils. ALso remember, if you have a 99 with the taller coils, when you put a 3 inch spacer in the front, your going to have a 3 inch lift PLUS the extra inch from the stock coils (4 inches total, over stock 4runner excluding the 99's with the taller springs). And replacing the rear coil with a 2.5in or 3 inch coil will only give you 2.5 or 3 inches over stock 4runner's. SO your stuck with a vehicle nose up, ONCE AGAIN.... it can be a catch 22... kind of confusing, but does that make sense?