Thanks again, guys. Trouble is, I agree with all of your observations
I think Dunk's observation about the extra 33% light-gathering power is persuasive. I was just looking at APM's website in Germany and was gob-smacked at the cost of their APM-LZOS 152mm triplet APO - over 10 500 euros...Puts things in perspective as that is nearly 17 000 AUD
for an OTA only (the likely cost of a new TAK FSQ130 (F5) APO quintuplet astrograph....This is sure big bucks wheen compared to SCT, Mak and Newtonian reflectors and Dobs in general...