Anyone can advise if ZERO X Unlimited Plan is worth it (heard that they don't allow tethering hotspot to your other devices)?

Zero X I haven't used but I think it is well better than others sim

How much data do you use? and how fast do you need your data. If you can peg your data use to a certain number, compare the prices and see if it is worth it to take unlimited data. As some workplace has WIFI, you may get away with lower data caps. However if you have high data usage, also factor in how fast you need your data. Streaming ZERO X looks good but just day to day task i believe you can get a better deal with Zero1