my only experience with the idq would be the v1 and v2 version, and I currently have a jl 12 tw3 in my vehicle. I am actually pretty impressed with the tw3. I was impressed with the idq back inn the day, but the 2 are not really comparable in my observation. the latest version of the idq may well be the equal of the tw3.
I would say that the tw3 is a worthy piece of equipment. dont think it will rattle the windows out, but should have decent output.
Where in Texas are you, if near Tyler- I would offer a listen to mine