IMHO - It seems to me some people are missing the point of the thread. Cinematic systems is trying to create a scientific review to explain his side of a open ended question. I can write a hundred reasons why Cabernet Sauvignon is a better buy than white zinfandel but if someone likes white zin my recomendation is wrong for that person. Bunkeromantik is asking for an opinion not a thesis. I think we all agree Thiel speakers are a exceptional product. I think we all agree that the 2.4s are an upgrade to the 2.3s. Thiel doesn't produce a new model without significant justifiable improvements (the 3.6s long run shows that). Where the gray area is is in the amount of improvement vs. the cost. Only Bunkeromantik's ear can make that call. Bunkeromantik, with the reasonable prices I have seen on Audiogon for 3.6s and higher Thiel models, I would recommend upgrading past the 2.4s(if possible).
