My local store, also my hangout, sells TREO. A friend of mine has single TSX10.22 in a ported box tuned to 37 Hz. Gets loud when he wants and sounds very clean powered by the JL 500/1.
I myself have had a SSi10.44, traded that in for a SSi12.22 and worked for a second SSi12.22 which is my current set up. 2- SSi12.22's in a 3 cubic foot box tuned to 37Hz and it kicks my as$.
I also build a box for the store for the new TE series sub. We, at the store, agree that the TE is a pinch louder (Like by 1 dB) but that the SSi actually sounds better. The TE is supposed to be their SQ line.
Look at my installs for both in my sig. The "No Limits" is my truck and the "Sierra-ously" is my friends.