I don't know enough about your 12" sheet metal tubes (which I assume are your DIY version of ASC). I have no experience with ASC traps, so I can't comment.
I don't have any experience with Dennis Foley's product. It might be good. It could be another variation of tuned membrane, but he really doesn't say. Keep in mind that they are $1,000+ each and are very huge. They have a really large 16" depth (which means they are going to stick out in the room like a large footprint speaker). They do have a very large 30x60 face, which would be good for low frequency capture. If you have the money and the room to place them, they might work out well. DIY tuned membrane panels at 55hz would be 6" to 7-1/2" deep depending on thickness of membrane (either 3/16" or 1/4"). You can build them as large as you want. Mine are 24" x 36". It is definitely an interesting design using dual damped front wall diaphragms and carbon damping. Could work out very well. Shipping will probably be very expensive (maybe 300-400 dollars each) because they are oversize and very heavy (I've read 150-225lbs each).
You would need 3 GIK Scopus traps ($750) to match the area of a Dennis Foley. Or two of the 24x36 DIY panels.