I've only had my MKII Optologic for about 4 months and early on felt it was a very good match for my system. It is a component that I could live with for quite a while.
Aqua offers two upgrade options. They also offer to trade in for an entirely new MKIII unit. That is enticing but I tend to agree with Designsfx to wait for feedback.
At present I'm early into tube rolling the 12AT7 and have 3 variants to audition with a 4th to be shipped. If this Telefunken ECC801S I'm currently listening to with only 20 hours on it is any indicator, there are tremendous gains in performance with the addition of one tube. If any LaScala owners have not opted to experiment with a tube variant, they likely are missing out on performance possibilities they practically currently own.
At this early junction I'm actually wondering if the MKIII offers as much benefit as a simple outstanding tube match.
LP