I bought the Transformers Steelbook since I was collecting all the locally released steelbooks (WAS because I disliked the plain white cover of Star Trek and bought the replica LE instead).
I was tempted to buy the Bumblebee version too since I have the 'transforming' set of the first movie but decided against it. I thought the money could be better used elsewhere. I kicked the habit of collecting multiple versions of the same movie sometime ago.
I didn't really looked at the 1 and 2 discs version until yesterday. The embrossed metallic case looks great, and both look better than the pricey Steelbook and Bumblebee versions. The fact that's its R1 is a bonus. The artwork of the 1-disc version (with the full robot) looks nicer than the 2-discs version (with the Transformer head artwork). Actually, it looked so nice that I am tempted to double dip... if the movie was as good as the first one, I probably would have succumbed to my old habit. But luckily, it isn't and my wallet won out.