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I normally buy sets like this because as you correctly said, your requirements may not necessarily be known ahead of time. I do however have one exception, I will now only buy wera bits after many experiences with other brands professional ranges. But they are usually purchased in singles. And rightly so!.. it will last ages.
My short answer to that would be 'I don't know what I need until I need it,' - I don't really know the common sizes etc. There don't seem to be any cheaper sets out there in the Milwaukee Shockwave range that I'm seeing - did you have something in mind?
If you honestly indend on using all the different various bits and attachments that come included which will be value for money. Otherwise, if you intend on using 2 or three different types then better to get a minimal set that doesn't include all the extra attachment which would be no use to you.
Complete DIY amateur question: I've got this DeWalt Combi Drill. I've been thinking about getting a screwdriver set to replace the cheap and cheerful Bosch one I currently have.Especially since I'll be helping someone move house shortly, and anticipate a fair bit of disassembly and re-assembly. Would either of these Milwaukee sets prove useful and a worthwhile investment? https://www.amazon.co.uk/dp/B01IC1K1B6?tag=amz-mkt-fox-uk-21&ascsubtag=1ba00-01000-org00-win10-dsk00-nomod-uk000-pcomp-feature-pcomp-wm-1&ref=aa_pcomp_aapi1 https://www.amazon.co.uk/Milwaukee-4932430907-Shockwave-Drill-Screwdriver/dp/B01IC1K1Y8/ref=sr_1_3?s=diy&ie=UTF8&qid=1529400286&sr=1-3&keywords=milwaukee+shockwave