1st timer building an ESB-4

came across this pickup http://www.lacemusic.com/alumitone_deathbucker.php anyone have any experience with it.. looks great to me..

I hear plenty of good things about the Lace product.
Haven't heard them personally yet.

Looked at a couple of YouTube videos. They are obviously designed for metal guitarists and to sound like active pickups. They can do clean, though on a guitar it sounds a bit characterless to me (web browsing seems to agree) and are built for distortion. They'd certainly have a lot more output than your current pickups, so with a semi-hollow bass, you might get feedback sooner than with the existing pickups. But more web browsing shows that they have been fitted to bases with reportedly good results. Again 'hi-fi' type response and very detailed - rather Rickenbacker-like. Which may not suit the innate quality a semi-hollow bass.

They aren't overly wide, so measure across your bass stings at the neck and bridge positions and see how that compares with the pickup dimensions. There is a 7-string version, so that would be an option if the 6-string versions seem rather narrow and I'm sure you could enlarge the pickup cavities if necessary.

The Lace website doesn't seem to give the dimensions of the normal Alumitones, just the weird pickup and 7+ string guitar sizes. Great going Lace!.