Very good price.
The Celeron T3000 is actually virtually identical to the Pentium Dual Core T4200, but runs at 1.8Ghz vs. 2.0Ghz. Both are 45 nm "penryn" Core 2 Duo derivatives.
Both are similar to the Core 2 Duo T6500, but both have 1MB cache vs. 2MB. Indeed, the Celeron T3000 could be called the Pentium Dual Core T4000, because it is that similar to the T4200, other than clock speed (again, 1.8Ghz vs. 2.0Ghz).
MSI is the only issue, as people in the MSI T6600 thread reported a few problems.
Other than quality, which could be fine, this is a great deal for the price.