I've tried guitar multi effects pedals in the past and found them a bit thin on bass TBH, I think you would be better getting one actually made for bass such as a zoom (which I have and have been very impressed with).
The dedicated bass pedals are much easier to get a decent tone straight out of the box, the zoom has some great bass amp and cab simulators already pre loaded such as Ampeg SVT, Fender Bassman, SWR, Trace Elliot and Aguilar 750 and all the compressors, Drives etc are designed specifically for the low end and at £130 its cheaper than the boss.