Die grinder with shaft vs foredom for carving

Hello carvers!

Does anybody use a flexible shaft on a die grinder? My Metabo has one as an optional (and extremely expensive) accessory, but I’m seeking advice before I think about purchasing.

Anyone try out the cheap eBay/amazon flexible shafts for using ¼ inch carving bits?

Or is getting a Foredom (similar price used to buying just the Metabo shaft accessory) the best way to go?

Any other suggestions?

I’ll be using it with diamond bits and a trickle of water, probably granite mainly but done basalt and softer stuff too.

Thanks in advance for your wisdom.