Given reviews from Amazon, classify those review based on their content into two classes: Negative or Positive.

Q: I've bought several air beds from various manufacturers. I bought one identical to this one 1 1/2 years ago. It was comfortable but lost air after 3 months. I justified this as the user may have not taken care. However, I now believe its the brand. This one would not inflate at all. I will not buy this brand again. I've had great life from a better brands.

A: Negative
****
Q: Just "assembled" the bat cave for my 5 year old. Pathetic construction and workmanship -- half of the gimmics don't work. Another pile of injection-molded plastic parts and stickers that I get to assemble -- what is this thing -- $4 of raw materials + $2 of shipping + $10 of marketing? Garbage. Shame on you Mattel, the only thing worse is the batman figures with the batarangs that take 30 minutes and a blowtorch to get out of the packaging. This batcave will collapse and die within hours of play, I'm sure of it. GARBAGE!

A: Negative
****
Q: While I couldn't put it down - I feel like I just finished a LONG outline. Great concepts throughout, makes me want to get out the telescope and look at the moon again and say "what if".Weber's style reminds me of WEB Griffin or Beowulf - each chapter peeking in on an hour in the action, spread over months or years, villains or heros dispatched with alacrity and gore. This could have been a framework for a whole series of books in the hands of another author, perhaps delving deeper into the characters and the worlds. But I certainly appreciate the classic scifi visions.

A:
Positive
****