I got this to go with a wand of Summon Monster IV in the hopes that having the stat blocks ready to go would help speed up game play. At first I balked at the thought of spending $7 for a resource that I could put together myself from the SRD...if I wanted to take the time to apply templates. But, as I started thinking about how long it would take to prepare all the stat blocks ahead of time, or to look up stat blocks online or in the bestiary (and considering that I had some store credit waiting to be spent), I decided to give this a try and see how it worked. I am glad I did, as just the SM II-IV lists would have taken at least a couple hours to put together myself in a comparable format, and probably would not have looked as good in the end.
Some things that I like about this product:
The stat blocks are clean and efficient, with no distracting fonts or wasted space.
Any left-over space is left as a "notes" area at the bottom, useful for tracking hit points of your summons.
The pdf is sized for standard paper. I was worried I would need to try to get index cards or some other size card to work in my printer, as I didn't see a page size listed on the file information. This does mean that you have to cut out the cards to separate them, but that is a small price to pay for the convenience of being able to use a regular printer. (Or you can just use them 4 monsters to a page, making for more of a condensed bestiary than a set of "cards," which isn't necessarily a bad thing.)
On that note , the cards are laid out so that a paper cutter set to 4.25 x 5.5 will cut them out perfectly.
The only "negative" I experienced, which can be easily fixed, is that there are very small margins. If your printer does not like to go right to the edge of the paper, you will want to tell it to "shrink oversized pages" to fit on the paper. This does not mess up the ability to use a 4.25 x 5.5 paper cutter, or hurt the end product.
Over all, I highly recommend this for speeding up the monster summoning process.