Having owned a RX 350 next to my X5 (RX was my wife's) my opinion is that the RX is not comparable to the X5. The RX is much smaller in everything (I am 6'5"): the seats, the legroom, the headroom, the luggage compartment. Plus the RX drives like a minivan (strange seating/steering wheel position, it feels unnatural). Maybe this is because it is based on a Camry.

Does this make it a woman's car? If you drive them both and subsequently cannot tell the difference between them then you probably are a woman...

FYI: I would NOT trickle charge my car in any climate. Cars are tested in worse than Arctic circle conditions and are designed to take extreme cold

FYI 2: check on real life mileage on the RX hybrid. According to user fora on the internet it is barely better than the gasoline version in real life. EPA MPGS #s seem to overstate hybrid real life MPG and understate diesel real life MPG