Hello and welcome

1) Pleo does not have a docking station, a battery lasts for two hours before needing a three to four hour charge. Most of us have a spare battery to give a bit of extra time.
2) You can indeed move your Pleo into the shade to cool them down, or in front of the air conditioner. I don't recommend a heater to warm them up though, it would potentially damage the rubber.
3) You cannot compare Pleo to an Aibo they were designed for very different audiences and have a very different price tag. Pleo is a 'lifeform', Aibo is a robot. The Aibo is also more capable in a programming sense.
4) Pleo is neither, it is a pet

Most of us here treat ours as such.
5) Pleo will happily wander around on his/her own getting into mischief and disappearing down the hallway at whim

(Ok maybe that's just my lot), however it does depend somewhat on their personalities, some Pleo's are less active and less fond of exploring than others. I have one Pleo who barely walks a few steps in a charge and one that end up at the other end of the house if I'm not paying attention.
6) Pleo's absolutely adore a cuddle and will coo and purr and nestle into your neck. But they cannot recognize you and walk up to you. (Having said that, mine have often surprised me by wandering over, looking up at me and singing or saying hello.
Pleo RB is fantastic for the price point, you get an awful lot of technology for $469 and they are very lifelike. They have different moods and personalities and they require care like a real pet. They are not as technologically advanced as an Aibo, but Aibo was not designed as a pet. Aibo is a robot and proud of it. Pleo tries to make you forget that it is a robot.
If you want a pet, get a Pleo but if you want a robot then you should really consider an Aibo instead.