guacI played ESEA demo on 120 ping while living in the UK, it was pretty manageable because I had pretty solid internet. At one point I played from France at 140 and that felt so much worse but could've had to do with the specific internet I had then.
From my experience, the ping can be as high as you want. Yes, the generally-agreed limit still applies, but what matters most is the stability of that latency.
That 150ms you have going is only going to be tolerable if you have a 150ms consistently. If each packet is jumping from low to high values, or you're dropping packets, it's straight-up not playable.