Others say...

"Endless fun"
We bought the robot for our 4-year-old three months ago. The key is to set your expectations up front. Think what you might get for $[...], which includes R&D, parts and labor, marketing and advertisement and sales commissions. For comparison, just for a high quality vision unit for a hobby robot in Japan enthusiasts are paying $1800+ ( I saw one myself in Tokyo in 2005 ).
1. Our son was not interested in most of the robot's functions right away. It took time. Also keep in mind that kids do not appreciate the complexity of the toy - they watch cartoons every day and for them it is a usual thing when a toy acts like a human. It was a great toy for adults in the first two months. Three month later he start spending with the robot 20+ minutes at the time on throwing and picking up the ball and other things. His hands are too small for the remote but he manages.
2. Batteries: we've spent another $[...] on rechargables but so far we had not have to recharge the batteries. Looks like this toy's power management is really good. We turn the robot off promptly upon finishing playing with it and we have not played longer then 15 minutes at the time a few times a week until recently.
3. Walking: we have pergo on slightly uneven surface and you can see it when robot walks. It does not bother us but the result is the robot does not walk straight.
4. Controls: very complex and adequate. Too small for very young kids but hey, the box says 8+. Great manual shows all of the commands in three tables. sequencing commands is up to your imagination.
5. Demo modes: really good and informative. Very good for starting using the robot.
6. Advanced stuff: we have not programmed the robot so I can not tell you much about this. Looks like it is going to be fun.

"Poor Robosapien 2 went through brutal torture and survived!"
I took robosapien 2 to a robotics demonstration at an elementary school a week ago. He performed for 6 hours straight with no battery change! At one point, there were so many kids in the room I could not operate him any longer with the remote control due to loss of line of sight. So I sat back and watched what would happen. Amazingly, he responded so well to the throng of children that I found I did not have to control him at all! They would hold up his pins or his ball and he would ask them for it, give it back, say hi to them, identify them as human and even yell at them if they pushed him too hard. The experience was so real that some parents accused me of having a secret controller hidden somewhere! It was truly amazing to watch Robosapien interact so realistically with the kids completely on his own. WowWee, you are truly genius!

"robosapien"
This was purchased for a 6 year old for his birthday I was hesitant at first thinking it might be to advanced, but with a little help he is doing fine with it It is one of his favorite toys It is well made and educational I do suggest rechargeable batteries

"A lot of fun "
I bought one of these on sale and have had a lot of fun with it. I haven't had any problems with using him in regular indoor lighting. I really expected him to drain the batteries fast, but he seems to do really well. He has some trouble standing back up on carpeting, but no problems on hard floors. He walks really slow, so don't expect him to race around your house. His throw seems to be pretty wild and for him to pick something up it has to be in just the right spot which can be challenging. The control works more like a tv remote than that of a radio control vehicle. In order for the Robosapien to receive the controls commands you must be in front of him with the control pointed towards his head and no obstructions in the way. WowWee did an excellent job with his physical mobility, with some practice you have a lot of control over the way he movies his head, arms, and upper body. For a toy he is very sophisticated, you don't find this much technology in very many toys!

"RSV2 Rocks"
I bought this for my 11 year old daughter and he is awesome. He moves even on carpet, dances, sleeps, guards, flirts, and evn ask for spare change. He is just a wonderful robot. RSV2 is played with for hours on end even though Christmas has past. I give it a 2 thumbs way up. Hey if it can keep my daughter occupied for more then a few minutes its doing something.