Got my RumourIV in 2001 and wouldn't hesitate to recommend a GB bass to anyone. Quality of build is second to none, mine is gigged regularly and is a pleasure to play, beautifully balanced, lovely tone. I wipe the bass down after every Show, put it back in the case and its ready to go for the next Show. Fretboard is lemon- oiled 2 or 3 times a year, other than that, very low maintenance. Battery life is good, there really is no down side to these. I would imagine that the likes of Shuker/Overwater etc are the same, so its really down to personal preference. I wouldn't swop for anything. Good luck with whatever you decide.
Cheers
R.