What I was looking to do with this design was to come up with a good sounding do everything all around woofer. Have done several Cerwin Vega deals over the years, I knew there was a market for replacement Cerwin Vega woofers and no supply to be had. So I modeled the drivers looks off that of the Classic Cerwin Vega or JBL style of woofer, but that is where it stops, this Woofer is right at home in a 3 ohm, 4 ohm, 8 ohm or 12 ohm environment. Power was a consideration too, I liked Cerwin Vegas idea of needing low power to drive the speaker, without killing the ability to endure high power output, that is why the Z48 can be powered with as little as 10 watts and will survive a 1300 watt blast.
Sound quality was a major concern, I didn't want to be able to tell the difference between a standard Cerwin Vega driver and this speaker in a simple swap out. I've got a pretty good ear, and couldn't tell any difference in sound. I also wanted a speaker that was built to last, I think this one fits the bill, in prototype testing, I ran the speaker 18 hours a day at full volume using a generic 500 watt RMS two channel amp, I ran the woofer everyday for 30 days straight without any degrading of sound quality or damage to the speaker. So I'd say they are built to last.
Bottom line is I don't think you can go wrong with this speaker and it would cost several hundreds of dollars more to get a better woofer, and even then it's a toss up.
Buy one then write about it yourself, you have an open forum here to post your opinion.