I think the complete kits are a bit of a waste of cash personally. The thing is, they tend to contain stuff that you won't use for your bike. Te best example is crank removers, which vary across several different standards and manufacturers' whims. Why pay for a square taper crank extractor when you have self-extracting FSA, or Shimano Hollowtech? Why pay for a stem spanner when you have an integrated Aheadset? The sets include different types of lockring tool, and have to duplicate to meet all the various standards, which must mean a compromise in quality.
There are very few jobs on any of my bikes that need more than a quality set of Allen keys, or two three way keys 1,2,3 mm and 4,5,6 mm
My advice would be to get the tools you need, surprisingly few for a modern MTB, from a decent quality source.
Superstar components sell budget price tools, which are surprisingly good quality.
Essentials if you are to do it all yourself would be
T handled Allen keys, 8,6,5,,4,3,2.5,2,1.5 mm
T25 key for rotor bolts
Chain whip
Chain splitter
Cassette lockring tool
Cable cutters
Crank removal tool depending on crank type( @
ScotiaLass can you post a link to your bike and that will determine which one, if any, you'll need)
BB removal tool, again depends on make
Decent set of pliers, bull and needle nose.
Cone spanners unless your hubs are sealed bearing type.
Workshop essentials are Isopropyl Alcohol,
quality grease with a small grease gun
GT 85
Coppaslip
Cable ties