I had to make the switch. I needed 6 seats since I have 4 kids and my wife.
The disco has been easy to work on. The HVAC works great, and doesn't have the issues my P38 had. I like the CDL, and being able to manually shift the transfer case. I don't have to spend lots of time fixing blown out tail light bulbs. everything thing on it just works. There are also tons of parts. My new job keeps me pretty busy. I don't have time to fabricate everything. So, If I can just buy a part and bolt it on, that's what I do. The money I make working is worth more then taking the time to build parts.
The downsides: the suspension doesn't flex as well, the traction control isn't as good, and the interior seating is smaller. And funny enough I miss the 4.6L V8 and ZFHP24 transmission. It seems like the ZFHP22 is always hunting for gears.
I have three inches of lift and I'm running 265/75/16's. I need longer shocks for the back. But other then that, I really like it. I do miss my P38, and I'm pining for another Range Rover. If my company decides to get me a company vehicle to use, I'm going to get a newer Range Rover or LR4.
Cheers