A total game changer when it comes to drum programming and songwriting. You can never have too many midi patterns and EZdrummer's search functions make it a breeze to find the right patterns from multiple packs, also ranking them by relevance to a beat you can tap in yourself in EZDrummer 2. I've bought around 24 midi packs all up and will probably buy more a this price. You don't have to redeem all 6 at once, so you can keep a couple in reserve in case Toontrack release newer packs better suited to your songwriting needs. There really is no drawback to these packs, and you can download the midi packs you want over time. The midi patterns are very natural sounding and if you're using EZDrummer 2 with its songwriting and arrangement tools you can create a really convincing drum track FAST. There are so many great drum midi packs available, for any style of music you could possibly want to write. These Toontrack drum midi bundles are awesome value.