again...sorry if you all knew this...or if a lot of newer cars do this..but i'm used to manuals or 10+ year old trucks

my IS350 downshifts in cruise control when it rolls downhill...kinda scared me the first time.

 

Yes, I find this quite annoying. Even on relatively gentle down grades the car will want to downshift in an attempt to maintain speed. It wouldn't be so bad if it was a gentle downshift, but often it is abrubt. Lexus needs a bit of fine tuning in this area.

 

yeah, I'm not a big fan of it, but I really only use cruise control maybe once a month. I don't like not having total control of my car at all times.

I only use it on one road at night where the cops in my town will get you for 5-10mph over. I'm in the sticks...they have nothing better to do.

 

Yeah, you feel the jolt when you are rolling down.. scared me too

 

noticed this also. there's one hill on the way home that no matter what i do it wont down shift unless i manually do it. sort of annoying but whatever.

 

I noticed this not only in cruise control but in regular driving coasting down a hill as well. The transmission just wants to downshift as if to save your brakes or something. I don't like it either and I bypass it by switching over to manual mode and upshift it to coast downhill better.