I've got a 1x30 belt sander, a Work Sharp, a couple of homemade strops, a Smiths 3 in 1 (ceramic sticks, carbide, and diamond stone), a Smiths 4 in 1 pull though (carbide v, ceramice v, steel v, scissors) and a Chef's Choice Pronto. I also used to have a Lansky and some diamond bench stones but sold them.
All I really use now is the Work Sharp and the strops. They do 95% of my work.
The 1x30 only gets used on rough work where I really have damage or I have to thin a thick blade bevel.
I use the Smith's 4 in 1 pull through sharpener on my kitchen knives, as they're all cheap and get tossed around in the knife drawer and dishwasher. The edges get dinged/bent and I'm not worried about getting a spectacular edge on them. All I want is for them to be sharp enough to cut easily and the pull throughs get it done quickly.
The Chef's Choice Pronto is actually a pretty good sharpener for a pull through. It used diamond coated wheels with a 20 degree angle and will produce a shaving sharp edge relatively quickly. It won't handle anything thicker than about .80" but I altered mine a bit to take up to .100" blades. I used to use it a lot on some of my Mora knives because I put a micro-bevel on them. Once you've got the blade bevel set for this sharpener, a couple of light strokes will make it shave again.
The Smith's 3 in 1 has a carbide pull through, 750 grit diamond pad and 800 grit ceramic triangular sticks. I don't use the pull through on it, but I use the pad and the sticks on my Scandi grind blades that I sharpen on the factory bevel.
I used a Lansky for 15 years. It did everything I needed it to do and didn't break the bank. I started with the regular 3 stone set and after I wore those out, I bought a couple of diamond stones and couple of regular stones. The only reason I sold it is because I got a Work Sharp.
The Spyderco Sharpmaker doesn't do anything for me. It is easy to use, but all crock stick systems are. If you really have to remove some steel, it takes FOREVER with one of these.
The biggest advantage of something like the Lansky or the Gatco (over the Sharpmaker), IMO, is the different angles you can use and that you have a wider variety of stones to choose from. The coarse grit stones from Lansky, regular or diamond, WILL remove a lot of metal quickly for establishing bevels. These systems are probably the easiest (and cheapest) way to get really good, hair popping edges on a knife.
If you can learn to sharpen freehand on a stone and get good edges, it is a skill that will help you out considerably. I can get a working sharp edge on a stone, but I was never able to hold the angle consistently enough to get a good shaving sharp edge on anything other than a Scandi grind type blade like a Mora.