It all depends on your flight skill. It's been a while since I have seen you fly so I'm not sure. If you are good at taking off and landing, and are willing to strip a gear every now and then, then go for it. I have them in the 600 and I will not change.
If I remember correctly, your heli is an HK500GT so this would be a MAJOR upgrade. If this were my heli, I would do it. But I like a very free spinning heli too. I just hate replacing gears lmao.