Giving up home DSL for tethering?

[Audi09]

In Los Angeles the fastest DSL serivce in my area is AT&T with 6gb, which is about a 510kbs download speed. My phone with T-Mobile with using the speedtest.net app is downloading at 620kb with 3G.
Should I give up my home DSL and tether from my phone instead? It's an unlimited plan. Would online video games work?
Would there be any problems doing this?

 

[toomuchgame441]

The only problem with that is that I hear that Tmo starts to slow down your data once you hit 5GB. If you can stay below 5 gigs of tethering on your computer while playing games and such then your set /sarcasm

No but seriously, since it reverts back to Edge after 5GBs then browsing would probably be annoyingly slow after that.