If it ain't broke, don't try to fix it.
You would effectively be a beta-tester for new equipment - which is proving to be as problematic as everyone predicted.
If you are comfortable with that and you are invited - them go ahead but do not return your Hub3 hang on to it for a while so you can easily get it re-activated to replace the Hub5 with no down time.
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John
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I do not work for VM. My services: HD TV on VIP (+ Sky Sports & Movies & BT sport), x3 V6 boxes (1 wired, 1 WiFi, 1 on PA) Hub5 in modem mode with Apple Airport Extreme Router +2 Airport Express's. On 250Mbps, Talk Anytime Phone, x2 Mobile SIM only iPhones.