For about 10 years I trained exclusively in Wing Chun and Escrima. The ratio of time spent was about 75% Wing Chun and 25% Escrima. -Looking back, I think I might have been better off having spent a bit less time doing chi-sau and a bit more time doing Escrima sparring and "live" Escrima drills.......

Escrima helped give me good insights into timing, rythm, use of range, transitioning, and using my eyes, which I did not get to the same degree from Wing Chun.

As long as it is not taught in a dead or robotic way (which unfortunately, some schools do) Escrima is an excellent complement to almost any art.