I keep reading reviews on amazon, and a lot of complaints and poor reviews for most of the products. At least a BB or KMS tools I can get a look at the product before buying.
It's next to impossible to beat the prices of tooling, such as carbide bits and the associated holders anywhere else, other than outlets such as Amazon, Temu, etc.
I was purchasing an extremely versatile "instant" glue for wood, metal, plastic, vinyl, rubber, etc. from Temu, because it's the only place it was available at a decent price. Amazon now has exclusive rights to the product.
One of my Rotary tables is home-built, from a mechanism that was being scrapped at the factory I worked in. When it closed down. I had access to some older Japanese lathes with a lot of power, so I scrounged some other materials, such as roller bearings, 8 inch round stock, which I milled four slots in an X pattern across the top, and attached it to the herringbone gearbox with a finger wheel on the pinion to adjust for degrees. Made up a steel "box", added 8 bearings, and a floorplate to attach to the milling machine table.
It works well, very solid, smooth, and accurate.
The other rotary table is commercially produced in the UK, it's adjustable from flat to 180 degrees, with the floor plate being attached to the mill table and the rotating table on the adjustable level table. It can be mounted either way on the mill table. VERY HEAVY, very solid.
Building the small rotary table was "fun" It would have been much easier to just buy one at the time, but I wanted to get a chance to "play" with the huge 32 inch swing lathes, capable of turning 300 pound molds with great precision.
When that place shut down, what they couldn't ship to their last remaining plant in Quebec and the new plant in Mexico, we either found someone who wanted the stuff or cut it up and threw it into the scrap metal bins.
I left there with $25K+ in tooling that would have ended up in the scrap metal bins. Anything that was useful for my small mills and two lathes, I got a pass to take out as salvage. There was a chest of cutters and bits, 24in X 24in X 30, with 6 drawers packed full with blank bits, from 3/16 - 1/2 on the bottom three and the top three were full of new carbide bits, ground HSS bits, of all sizes and different thread shapes, etc.
The large commercial rotary table came from the same place as did the Aloris tool posts/ quick-change tool holders.
I also managed to get enough nuts, bolts, cooling/cutting fluid, cooling pumps, pressure air equipment, micrometers, flat steel, flat copper, brass, round stock, and flat bar to last the rest of my life and then some.
We were allowed to salvage tons of aluminum, cast iron, brass molds, equipment, shelving, tools, and even 1500 liters of Diesel Fuel.
It was a heck of a "bonus"
I got paid to do it, as well as a good pension/severance package. What a way to retire at 58. It was like winning the lottery.
All of that scrap metal, mostly clean, brought premium prices from the scrap yard.