hell no there is no point unless you have a raging boner for the voice overs in Fray that you get in the Turbo R version, and want to play a few other good Turbo R exclusive games.
They are expensive. VERY expensive. 500$ expensive for a loose one and sometimes 1000+$ if its boxed, plus shipping, and usually have broken FDDs like everything else old and MSX. If you find it stateside, good luck. the seller will probably want 1000$ for a loose one.
They are fully compatible with everything MSX, and should only be bought if you really have a fist full of spare money. You get the R800 processor and 512k RAM which is really only important to you if you're doing dev-stuff. It does nothing for you gamewise.
and, as for next cubes, Nooooo. Noone should buy a nextcube. they are junk. B&W screen? bleh.
the cheaper alternative to a 1541U is buying the 12$ X transfer cable and writing .d64s direct to 5.25".
plus then you can hook your disk drives up to your PC and use them in winVICE, which is great. I used to take a 1541 around with me and play games on my laptop, lol.