I owned the Quatro woods (not CT) and loved them. However, when I heard the Treo CT I thought the new CT tweeter was a big improvement. and wanted to upgrade to the Quatro Woods CT. However, the upgrade is not available. I upgraded to the 5a Carbons, which are great. However, at your price point I would go with a new pair of the Treo CT or the Quatro wood CT. Ask Johnny R. for a demo.
