What benefits to expect from tonearm upgrade


Dear all,
Seems that it's time to upgrade my 5+ years old ortofon as212s arm.

To be honest I am quite skeptic on the benefits of tonearm upgrade based on some demo that I listened to. Unlike cartridge or table.

If, for example, I upgrade to $ 5,000 or more tonearm, and say it matches very well with my cartride (lyra kleos) and my table (TW Raven One).
Is the benefit audible? In what way?

Thanks in advance for any advice
gondo101
Schubert, when I reread my post I can see it may not have been clear. The Basis Vector tonearm was far superior to the Basis modified Rega tonearm. The difference was to me astonishing because I did not think changing just the tonearm could make such a noticeable difference. This was in my system using the same turntable and cartridge. Kurt_tank earlier in this post indicates he had a similar experience.
Dover...you didn't read my post carefully. I agree with you if you go from a crappy arm to a great arm....however...if you listen to arms of the same relative class, any difference is minimal.
Schubert, are you still looking for a replacement for your ADC LMF tonearm or did you find a new stylus for your ADC XLM cartridge?