I bought the 2010 RX 450h after having a 2002 GS 300 that served me greatly for 7 years.
However, the RX stranded me in the middle of a busy intersection after 1 month and 2000 miles.
This car has given me nothing but problems since I bought it and it has been in the shop 20 days of the 50 days that I have owned it.
Lexus does not build the quality cars it used to.
I would not recommend buying this car.
You will regret it!
Leuxs builds cars just fine.
You provide zero details on how it "left you stranded", and no details about your "problems".
I frequent the Lexus forums daily, and I've never - ever - heard anyone say that in three years.
Either it's "user error" on your part, or you happened to get a lemon.
Either way, that's no fun for you.
However, the rest of us are enjoying automotive perfection in the 450h.
I know 5 people with a RX450h including myself.
None of us regret anything.