We were there for the State Chess Tournament. I hate to admit it but having lived in Seattle for 18 years, we've never been to the Tri-cities, so literally didn't know what to expect. First of all, its super quick to get there. Just 3 hours from Seattle. The Hilton Garden is *the* place to stay if you've got something at the Convention Center. It is across the street. The rate was really great. $75 a night and that includes free broadband Internet access! Doesn't include breakfast though. That's $8 but include omelets made to order, waffles, etc. $4 for kids.
The staff there is Washington friendly. The only real bummer is the pool is pretty small, although the hot tub is warm. So if you've got a family thing out there, the price is good and the rooms are fine, plus there is broadband and free printing from your computer.