Horses for courses...
I use a cheap (£20 from axminster visit) grinder for reshape / re-angle.
Then use the WS3000 for all my blades where i want a fixed preset angle that it supports (about 95% of my sharpening needs)
Then I use a quick scary sharp with honing guide for any cambers. These only tend to take a few mins anyway. However you could use oil / water stones just as well.
so I only need a grinder when I get a new tools / iron = 2% of my grinding/sharpening time
I need a very quick and foolproof method to "get back to work" 90% of the time
I need to camber plane irons about 8% of the time and prefer by hand.
Therefore I have in my case spent the most money where i spend 90% of my time.
If I bought a Tormek / Scheppach Tiger, I would have spent 50% of my cash on 2% of my needs.
If you do a lot of handplaning, and need to camber sharpen all the time, then your needs will be totally different.
For example, I am getting more in to turning, and although the WS3000 has slotted discs for under cutting, I find maintaining a fixed angle difficult there, and the discs are a pain to swap grits on, so I am looking at a Scheppach water grinder, however _only_ because I am changing where I spend my time, and what my needs are.
Hence we all need different systems.
For anyone with a WS system, who uses fixed angle chisels and plane irons, and needs to quickly re-sharpen often, it's unbeatable. I would not recommend it for turners.
I have tried 3 types of discs, automotive, WS branded, and cheaper oxide.
I would say the ones you get with it are best, any Norton ones you can buy online cheaply will be more cost effective and almost as good, cheap ones are not great, and you have to change so often, probably a false economy.
With the kit I think you get a coarse, fine, very fine, honing disc. Wait util it's on sale with the leather wheel included for free.
Out of the box, it's really missing a medium grit, so from coarse to fine can take a while, grinding back old chisels on the coarse grit I found to be fast enough.