Yeah, I think we get caught up in collecting toys, but we all have our "go to"s that we prefer, since truly mastering them can take a huge time investment. Sadly, I have a truckload of hardware that falls into the same bin, since they are very cool with limited application, but the time needed to master them can be immense.
Spitter sort of leveled the playing field, as it were, against those who want to confine you into their GUI with proprietary content (AD being one of them). As much as I enjoy AD and its sounds, the inability to easily make humanized step sequencer patterns left me looking for another alternative. Spitter is one of those "niceties" that is worth its weight in gold. Another neat trick is to use Audition for the same purpose, since Audition will beat-slice samples to a customizable threshold, and then creates a file for each. The "issue" with Geist (and why in can get RAM-intensive quickly) is that it loads the entire wav file, and the "samples" are really clips, so I have gotten savvy at keeping samples to "only what is required" to get the most from it.
The jazz improve course is awesome. Jazz is a new genre for me, and the perspective of Gary Burton is quite refreshing. He is very forthright on why he is not a proponent of some learning methods out there and explains why readily. He does not believe in "learning licks" or playing scales sequentially (classical method), but is more focused on learning scales/modes and their application (thus far). If you have time to nab the videos for the course, they are definitely worth downloading even if you do not participate in the course itself.