While a lot has been written about the BigRigs already, I want to add my 2 cents.
There are some who aren't getting what they are looking for from the bridge pickup. IMHO the BigRig bridge pickup is fantastic! If you are looking for the Jaco single coil burp, the BigRig will approximate that sound, but it is not what they were designed to do. The bridge pickup has these beautiful mids, almost a vocal quality - great for fretless.
And speaking of single coils: If you are considering switching options, I recommend including single coile mode. The difference to parallel is small but I actually prefer it. And volume is the same as in parallel, in case anyone is worrying about the offset polepieces.