I also have been looking for a small diameter flexible hose to use on my lathe. My requirement was that the hose had to be straight, not coiled, 1/4" diameter, and very flexible. As a hose to be used at my lathe I would be operating at a reduced pressure, with a 1/4" regulator mounted on a manifold at the rear of the lathe. What I landed on is a braided air hose made specifically for air brush work. These hoses are normally sold in 6' or 10' lengths (perfect for me) with mfr specific fittings crimped on each end. I have seen product listings that claim NPT, BSP threads etc but after reading various reviews and product literature concluded that what I might get for fittings is a bit of a crap shoot. These hoses can be purchased for between $8 and $20 and there are conversion fittings available to convert threads to NPT or other should you elect to convert rather than replace the end fittings. The conversion fittings are often more expensive than the hose.
The one caution I noted for myself is that these hoses have a reduced maximum pressure spec and I should not use for higher pressure.
I cannot address your last question regarding experience using as I have yet to purchase and install - when I do I would be happy to circle back and comment.
Not endorsing this hose for the application but it is the one I highlighted as suitable for me.
https://www.amazon.com/Master-Airbrush-Premium-Braided-Standard/dp/B001CJHZXS/ref=sr_1_7?crid=ODW6HMH2YZUD&keywords=1/4"+airbrush+hose&qid=1650630048&sprefix=1/4+airbrush+hose,aps,125&sr=8-7