I'm aware of the complaints when the 8 speed first came out. Lots of complaints about shifting behavior, very few had issues but the behavior was unpleasant. Toyota rectified that years ago. I find the transmission programming to be just about perfect. I want my transmissions to behave in a responsive manner yet upshift as soon as possible while staying in the power band. This does that. No complaints from me. In fact, one of my pet peeves is when transmissions hold gears longer than necessary. Give me all the power I want when I want it, and then get into the highest gear possible as soon as possible when I don't.You may not have first hand experience or know, but when they came out with this body style and powertrain I test drove one and tried to negotiate one down before buying my Mazda 6. I couldn’t stand the way the transmission was programmed to up shift so fast. I think it was lugging around the dealer lot in 3rd at like 10mph. Nothing was wrong, it was just the way it was programmed. I read a lot of noise about it on the internet and everyone suspected they’d update software, but when I bought my Mazda I quit reading up on it.