Altec 510 reviews?

I would like review information or opinion on the Altec 510 speakers that were re-issued I believe in about 1999. My brothers each had 511's from the 80's and one had studio 14's. They both kept the 511's as they loved the full sound. I purchased the 510 model as 511's are not in the re-issue group. I have thought about moving toward some 604 based speakers or some Klipsch but really just want to hear of any reviews. I may save myself the cost if the difference in listening experience is not that substantial. Problem is I cannot really 'try out' any other speakers as in this area only new systems are available. Help!