I have an American SB-2 and Kiloton 4. I don't play any of my other basses any more except a Squire VM Jazz about 5% of the time.
The playability, tone and weight of these two G&L instruments has RUINED ME for anything else I have. The uniqueness of the G&L MFD pickups grabs my attention every time I play them. I find that for me, the Kiloton pairs beautifully with my Mesa Walkabout and the SB-2 is an equally great match with my Mesa D800/SW112/115. I don't dislike either instrument with the other amp, but right now I just like those pairings (like a nice juicy tender steak and a good glass of red wine

- well, the SB-2 is more like Mad Dog 20/20 sometimes

).
I don't play 5 strings but the video's I've seen of the Kiloton 5 sound amazingly clear with a more pronounced B string that other 5's that I've heard.
You guys are gonna love these basses and I can't imagine you'll have a single regret! (except the wait...

)