"They can work occasionally, but against CLS and Rex lead they are the worst possible team you could think of to use since they will counter attack you to death within 2 turns, literally, and you'll just feed Rex lead an insane amount of turn meter (you can daze them with Logray but they'll almost always have R2 on the team so it won't matter after 1 turn anyway)."
A Teebo leads grants stealth to the entire team on a regular basis so counter attacks are usually not a problem.