Dremel 4000 worth buying?

[Dennis]

No, you can only use burrs and drills which are mounted on standard 2.3 mm shanks. This is so for all machines, which don't have a selection of collets, or a three jaw chuck with a key.

In addition, I would not attempt to drill metal with a machine going lower than perhaps 0.6mm drills, for fear of breakage. Getting out a broken drill means dissolving it out. Remember, you are physically twisting your drill in a hole until unpredictably it will fatigue.

For texturing, you must experiment, but on metal low speeds are best for your tips.

Generally for drilling small holes in thin metal, round burrs work best for me.

I can't really choose for you, as I would be in enough trouble already if the deal goes wrong. The name Marathon, seems to be used indiscriminately by a number of companies in the Far East, so all you can hope for is the protection of EBay, Amazon, or whatever.

That said others I know have bought them without bother.

Dennis.