Although the device is very suitable for engraving, partly due to the flexible shaft, it does the other things it should be able to do very poorly.
Milling, even with a jig, is sloppy at best. It is difficult to control (with the milling attachment) and the knife easily pushes itself into your workpiece with the direction of rotation. It is certainly not possible to work off-the-cuff. The milling attachment is rickety and only somewhat stable at the greatest depth, but there is still some play in it. You're even better off using chisels and gouges.
The sanding belts and discs work well, but are only usable at very low revs and very small workpieces. If the workpiece is larger than a few centimeters, it will not be possible to get it flat, and with more revolutions you will have lost too much mass before you realize it.
The grinding wheels have too small a diameter to be able to do much. Grinding off the end of a tube is possible, but not more than a few centimeters because then the device will come into contact with the tube. Because of this, you have to hold the disc at an angle, which makes it easy to go wrong. If you want to sharpen serious metal, you really need an angle grinder.
I haven't done polishing yet, but I estimate that will go well with small objects, as well as drilling, provided you can keep it straight.
Since there is NOWHERE to find everything in this set, which caused me to guess wrong for €159, I'll just do what Dremel himself refuses:
Flexible shaft - Very practical when engraving! - usable
Detail handle - Especially useful when drilling - usable
Editing platform - To keep the device at a certain distance, or in combination with the not supplied Dremel vice to fix the dremel - usable
Angle attachment - To get into corners or to set the attachment at an angle - useful for specific things
Cutter attachment - To keep the cutter perpendicular to the object, but is much too rickety for that - worthless
Line and Circle Cutter - Haven't used it yet, but won't be. Also rickety, doesn't seem reliable - unusable
Aluminum Case - To store everything. Nice idea, but the drawer cannot be clicked closed, so it opens when it is tilted or you walk with it. Furthermore, everything is stored very inefficiently in shapes in a foam mat, so that it remains intact but almost nothing fits in it. - waste of space, purely for show
Manual where only the device, attachments and safety are covered, but not the attachments. Nothing is explained about that, not even which mandrels should be used for which things. There's also no name/item number on it anywhere, so you'll have to google some things to find out what they're for and how to use them. The mandrels are also not explained. How the sanding discs should be attached and with which mandrel is still not clear to me.
10 fine sanding belts (no grain size indicated) with a diameter of 15 mm
10 coarse sanding belts 15 mm
10 fine sanding belts about 10 mm
10 coarse sanding belts about 10 mm
15 sanding discs approx. 20 mm grit 180
15 sanding discs approx. 20 mm grit 240
2 mandrels for sanding belts
72 total
1 spiral cutter 3.2 mm
1 tile cutter 3.2 mm
2 total
20 grinding wheels approx. 25 mm
3 metal grinding wheels 38 mm
2 PVC grinding wheels 38 mm
25 total
1 mini tub of polishing paste (too little to be really useful)
4 polishing discs approx. 25 mm
8 polishing discs approx. 14 mm
1 brush that came with the polishing things so must be for polishing
14 total
1 metal drill 3.2 mm
1 round head milling cutter approx. 2.5/3 mm
2 total
4 grinding wheels 24? mm
1 conical grinder 2.5?-1.5? mm
1 conical grinder 4?-2? mm
1 cylindrical grinding wheel 11/12 mm
1 grinder 11/12 mm
8 total
1 mandrel SC402
1 mandrel 401 with thread for polishing heads? and sanding things? Explanation is missing
1 mandrel 402 for the same things but different?
1 collet
4 total
= total 127. Is the latter the dremel itself or am I missing the mandrel of the sanding belts?
All in all, this set contains a lot of superfluous or unclear things. The accessories are too diverse to be useful to everyone, but there is far too little diversity of each type to be useful for the specialist. So don't think that you will end up with 128 accessories, because you will have to buy things anyway if you really want to be able to do something with them.
A large part of the attachments is simply unusable, so don't fall for that either.
My conclusion is that it is better to buy the device and accessories that you are going to use separately.
It sounds attractive to buy a set with all kinds of attachments and accessories, but in the end it's almost just a show and it is of little use to you. The device itself is fine, but this set is just pure pretentiousness and definitely not a good buy!
