That would be an extreme bargain, 600GBP.
Does it have variable speed and exchangeable contact wheels for that price?
Do you have a link?
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Well, Mine came from Germany.
Bandschleifer Modell 2-SF
As you can see, pretty expensive. I found another supplier in Poland but they were the same price level.
I know you can build them yourself, but good contact wheels are also not cheap, and it can take a lot of time to build a proper one. In my case, I decided that the time needed to build one was more valuable than the money to buy one.
My experience was the opposite. I spent months debating with myself whether I was actually going to buy it or not. Then my wife sat me down and asked me if I really wanted it, and if it was worth the money. I said yes and she told me to just buy it then.
I don't enjoy fancy clothes, or shoes, or go out with friends to a bar, don't go to sports games etc. So all in all, I don't spend luxury money at all. I never got any of the ADs. It's the one and only hobby I really love (other than martial arts) She told me that I never spend money so if I really wanted to have this, I should buy it. That was before I became semi professional so this was household money.
Next month I'm going to buy a second one of those, as a business expense. You might wonder: why would you need 2? The answer is simple. I am a semi pro bladesmith, and my belt grinder is the most critical tool I have. they come with a lead time of 2 months, so if my current grinder would fail for whatever reason, it may put me on idle for a long time. Having 2 means less time lost switching attachments, but also a backup in case one of them fails.