First off since you already have a good number of tools, a tool set will just give you duplicate tools you won't need or use.

Second, for those who don't have much in the way of tools, I strongly recommend against buying a tool set. All you need to do is to buy tools as you need them that way you don't have tools you may never use either because the part requiring the tool will rarely if ever break or your mechanical abilities are lacking and you don't want to bothered; and some tools in those kits you already have like screwdrivers and allen keys etc. I have classic cars I work on, I never bought a tools set, I just bought tools as I needed them; I did the same with my bicycle tools.

Of course there is the argument that you can save money buying a tool set, true, but the problem with that is if you only ever use half the tools then you wasted money.