If you know what your doing with a UDM than I suggest skipping the Flex and moving onto a rotary, but dont sell your UDM just yet! I felt the exact same way when I wanted to buy a rotary but trust me its not that intimidating. Do some reading on how to properly use a rotary, the Dave KG rotary polishing guide is a great source for information and Nica's poishing videos are awesome as well.
If you do choose a rotary then practice on scrap panels first to get the hang of it. Its what I did and it didnt take very long to get used to it. Just work at your own pace, it really is not some vicious machine, its one of the best tools you can use in your detailing arsenal. When I bought my Makita I also bough a paint thickness gauge, no its not an absolute essential item but I feel comfortable having one just to be sure I have enough clear to work with when I polish. But if you buy a rotary and arent going to polish customers car for a while then hold off on the PTG.
With a rotary you can obviously do heavy correction/compund work and polishing but for applying a sealant or finishig glaze use the UDM instead. I own both the 3401 Flex and a Makita and use the Makita most all of the time but when applying a sealant or fine finishing polish I often go back to the Flex.
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