I loved my W-735H! Wore it for a long time as it's great for Pomodoro. Gave it to a friend after I replaced my trusty Polar m430 for a Garmin Instinct as it has a vibrating function AND the ability to program multiple countdown timers. After a few months though, I started missing the dedicated vibrating function and bought a used GD-350 off Ebay. It has basically the same features, BUT looks way better, is a G-SHOCK and has a dedicated timer starter button. Still prefer the Instinct as I can have multiple countdown timers already programmed, but the GD-350 is still a gem of a watch.
Is there even a watch with a vibration alarm with battery that lasts more than a few days? (Mine advertises a 10 year battery life).
I find all gshocks only have sound alarm, no vibration.