I have a friend that uses godhand nippers. The problem is the law of diminishing returns; good Tamiya nippers are like half the price and work almost as well. You will still have to do some sanding and buffing with either. Your time savings on Godhand vs Tamiya nippers are much less compared to the speed difference between dollar store nippers vs mid quality ones. If you have the cash to throw around, better nippers are extremely helpful.

For cutters, I use a cheap pair of $4 specials I got from the hardware store. The thing is, I got lucky; this pair already had a fairly narrow blade end, decent cutting angle, and the blades line up perfectly. Many cheap cutters are bulky. The blade ends are thicker so they can cut tougher things like metal without breaking. We don't need that for model kits. The cheap cutters are usually a bit dull, and have slightly offset blades (which cause the plastic to stress since it bends a little when cut). I decided to modify the cutters so they are easily on par with a $25 pair. How? The better nippers have blade ends as thin as possible and very narrow cut angles. I used a dremmel tool grinder attachment to wear down the excess metal on top so the cutter ends were thin, sanded down a slightly sharper angle, and replaced the inner spring with a stronger one. I basically kitbashed my nippers into something far better. Drastic, I know, but it works for me and cost me nothing. For most normal people I would say to skip all that and just buy some mid level ($20-30) pair.

For topcoating, make sure you sand and buff your kit properly first, as imperfections will likely show through if you don't. If you plan on flat or matte topcoating, I use Krylon mostly as it is a very quick drying brand. Rustoleum is also good but has a longer dry time. I make sure it says non yellowing just to make sure. You get a ton of paint in those cans so they will last through many kits. If you plan on gloss coating, you can still use those brands, but make sure the main paint layer is higher quality hobby specific spray paint. Commercial spray paint has thicker pigment and even if you are careful, it is possible to cause what some call 'orange skin' where the paint is a bit mottled. Gloss coats will amplify any mistake while matte and flat topcoats will help disguise them.

I am an advanced builder (well I used to be before my Gunpla hiatus) but I am also a cheap bastard. I also like a challenge. With patience I have learned how to use cheap tools and still produce quality results. As others have said, better tools will produce a quicker (biggest benefit) and likely better quality product. My only addition to this is that just like martial arts, if you do not have a good foundation and understanding of the principles, all the advanced techniques in the world will be of little help.