I have the mini vacuum attachments package for sewing machines (good for areas of my computer also); it works o.k., up to a point. Can't get to the tiniest spots, but those areas pretty much require a service call to the dealer anyway. It does suck up a lot of dust and is REALLY a boon when it comes to cleaning the lint from my serger. The mini attachments come with a plastic tube hose, which attaches to a vacuum cleaner hose; the type of vacuum cleaner is a factor, also. The one I have now, which is a Dyson, is a BIG pain in the butt for using ANY attachments, so I thought to use my hand-held Dirt Devil when using the mini vacuum, but it doesn't have enough power to do the job.
To sum up, if you have a good vacuum cleaner that easily adapts to using its various attachments, the set of mini vacuum attachments is useful. Before my old Hoover died, I used it with the mini set and it worked fine.