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Erm no in fact they compliment each other.
If you add contacts on the tablet it will be instantly available on the phone. Also if you buy software via the web page you can select what device should get the software, or if you want both you can. The software is linked to the account and not the device.
Only place where you sometimes pick up issues is when someone send you an initial message vie Google Talk, I dont always get the notification on all the devices. Once you respond on a device the rest of the communication is fine. (My tablet don't always get the notification but my primary phone does)
from experience point of view I have 2 phones and a tablet on the same account.