I was running Bitcoin Core on an external USB hard drive, and it would take forever each day to let it update (well, an hour + at least). And while it was updating, my computer was really slow.
Electrum is great. I wish I had switched to it earlier. I figured the day would come when the blockchain would get bigger and it would make sense to switch to a light client. I think that day has come (at least for me).
The light client is just so convenient isn't it? I had a payment come in very shortly after installing Electrum, came in very fast no problem, everything that needed to be downloaded was just no issue at all since the filesize was so small to begin with