I'm using this to sample all my percussion instruments. It's the most intuitive interface I've used for composing percussion. For instance, I can just drop a sample into a pad, assign it to a note on my drum map, right click to get it to choke another sample, and start entering my beats by playing them on my controller or drawing them with my mouse.
Love the interface and simple tweaking. With velocity layering I would use it even more. I personally like it clean and would prefer it not venture into FX. Funny, I thought this was more of a rating than a review. No one found it useful, hence...
Sitala is a simple, low CPU usage drum sample player with 16 voices, drag and drop loading, and six simple tweaks for each pad: shape (ADSR), tuning, compression, tone, volume and pan. It's super easy to alter sounds, but there's no detailed editing of samples. It's one sample per pad, though velocity layering is on the road map.
The interface is attractive and easy, and it's cross platform and available in VST and AU flavors so you can use it with anything but Pro Tools natively. The included kits sound very nice and you can get unique sounds in no time. Highly recommended and free.
Fun thing, best feature is the drag and drops and whatnot. Would be nice for internal effects as an addition but I've had cases where it cannot remember my custom kits and I couldn't load the samples back, rather I had to do it from scratch.