3 reviews:
1 - Said his broke in 5 minutes (I call this a fluke)
2 - Said the 1/4" jack needed resoldering after a while (a lot of equipment I've had over the years has had this problem, that's why I know how to solder

)
3 - Glowing review stating the unit works great and allows more low signal thru than previous units he's had (said his Low B now sings).
What caught my eye about this unit was that it passes frequeny down to 30 hz or so. From what little I've used it thus far, I have to agree that this is true. My low B punches thru loud and clear. Again, I'll report more after the outdoor gig on the 23rd.