Adidas Boxing Boots Comparison

I'm looking to buy a pair of boxing boots but there aren't any stores where I can try them on

The ones I've seen online that I like the look of are

1. Adidas AdiPower

2. Adidas AdiStar

3. Adidas Box Champ Speed 3

4. Adidas Box Rival 2

5. Adidas Tygun 2

6. Adidas Box Hog

Can anyone give a comparison between any of these shoes and tell me what the differences between them are, or just give a review on any of them

Also I heard that you should order half a size smaller than you normally wear when ordering adidas boxing boots, is that true?

Thanks