I just put the Knighthawks in my '96 2 weeks ago (low beam only). They definately helped. I have also used Silverstars in other vehicles, and those helped too. However, I don't like the fact that the Silverstars are only expected to last 12 months (per Sylvania), and they are a bit pricey. The GE's are cheaper, so if they only last a year too, then I won't feel so bad (I lost muliple Sylvania's).
Granted, the bulbs I removed from the low beam sockets were the useless "cool blue" bulbs that are actually dimmer than stock headlights (the blue tint on the glass blocks light output). But still, I think they are an improvement over stock type bulbs.
As much as I'd like to get the JD bulbs, I'm assuming they are not DOT legal smeant to fiince they are not meant to fit in 9005 or 9006 sockets. If I need extra lighting, I will put on a single pair of accessory lights (which are legal with low beams).
I'm also coming from the world of 1st generation Toyota pickup and 4Runner 6x8 headlights, and the LandCruiser's stock lights with cool blue bulbs spank what I'm used to. I was thoroughly impressed with the 4crawler headlight harness I installed in my '85 pickup though, and I will eventually put a harness in the 80 too.