Eventually you will discover that you cannot tag vlan 1.
If you ever want to "trunk" vlan1 across a trunk port with other vlans you will have to change it. Some gear might allow it, some might not. The stuff that won't is usually the higher end gear that is actually trying to meet the specifications.
Once you decide to start tagging any traffic at all in your network, you are better off forgetting vlan1 exists. In the dot1q environment, it doesn't.
Using the default management VLAN 1 for real traffic is usually a hassle.
Using it as a management VLAN is usually a hassle too. Yes, it's easier out-of-the-box-for-the-typical-frys-customer but it's just, well, suboptimal. If you have gear that HAS to have it's management VLAN on VLAN 1, you are way better off setting up an untagged port on your real management vlan on a real switch and plugging such gear into it. Any gear that doesn't let you change the management VLAN from VLAN1 should be discarded.