yes. i just took it up a few months ago but it hs been extremely rewarding and satisfying so far. it's more challenging and at the same time simpler than i could've imagined. it's fun, it's relaxing, it's heaven.
having said all that, you may want to consider that i have no theory background, nor have i made an attempt to larn any instrument in my life until i got a bass and an amp back in november. i don't practice as much as i should, and i only know a couple songs. i've never taken lessons.
the bass seems to me to be something that is under appreciated (present company excluded of course) and it (the entity of the bass) seems to want to keep it that way. i'm not a "center of attention" kinda guy either...it feels like a perfect fit for me. the sound is pure sex. the tactile sensation of strumming those thick strings with your fingers is like nothing else (yeah, i've picked up a guitar a few times...fun...but something about playing with your fingers makes it so much more intimate). the fact that you can FEEL the sound only serves to make this instrument more physical, more sexy.
the fact that i could spend a thousand bucks and get a little setup that will probably keep me entertained, sane and focused (nothing else ever could, not even women) for the rest of my life brings a satisfaction i've never known from a simple purchase. i'm obsessed now, the sound consumes my thoughts. i'll put my baby down and hours later i'll still hear scales repeating to the metronome in my head.
guitar players have said to me that any guitar player can play bass, so you've probably already got an ideal foundation having taken lessons. just don't underestimate it or sell yourself short. you're not just the guy between the drums and the guitar, no matter how bad they want you to play that role.
the glory of the bass lies in the ears of the affectionate music connoisseur. if the bottom end blows your mind like it does to mine, do it. you couldn't possibly regret it.
afterthought: i've known a few drummers and a lot of guitar players. i've had friends who played the violin, the flute, the clarinet, the synth...but i'm the only bass player i know. if you're dedicated, i doubt there's any shortage of work for a bass player.