I really just “needed” a second head. I have an mb500 but wanted to be able to just leave an entire rig at our practice space (the mb500 is a lot to lug around). I came close on an swr, but then I found a 400rb well under 200 bucks and grabbed that instead. It really is a great head.
With the prices many of these classic GK and SWRs are going for on the used market, I'm starting to feel now's the time to scoop one or more up. Not that I buy equipment as an investment, but I wonder if sometime down the road these brands/models will become highly coveted and collectible. Enjoy your 400rb!