The missing step in much of this 3rd party arranger content is the care to balance it with the rest of the sounds...

Arranger players are strange ducks. Unlike WS players, we expect to be able to change from any sound to ANY sound, from any drum kit to any OTHER drum kit, and not have to immediately go hunting a slider or two to bring the volume up or down, or reduce or increase the reverb, or make the snare drum quieter, etc..

Without that, you either have a bunch of work ahead of you to balance it all yourself, or your heart is in your mouth any time you decide to call up a new sound you aren't 100% sure you know what you are going to have to grab!

More sound designers need to be made aware of this if they are designing for arrangers.