There are a few things I can say about the Samsung Galaxy S Blaze 4G. The Android Gingerbread phone might not be the most high end of all, but it offers a huge performance increase over the original Samasung Galaxy S phones, yet keeps the familiar design.
That 4-inch Samsung Super AMOLED screen is always a crowd pleaser (at least in my crowd of one); the 5-megapixel camera takes consistently good shots; there's a front-facing camera for video chats; and I have no complaints with the dual-core on-board processor. Even call quality behaved.
The single most worrisome issue I encountered during my testing was the 4G speed, which seemed somewhat inconsistent and sluggish, at least compared with what I expected for riding on T-Mobile's HSPA+ 42 network. Lest you think I'm damning the phone, let me say that every carrier has its stronger zones and pockets, and it could be that T-Mobile's network is fast as can be in your neighborhood.
In fact, I would absolutely recommend the Blaze 4G overall for its upper-middle-class features and performance. You can read my speed test results, see photos, video, and all the pros and cons in my full Samsung Galaxy S Blaze 4G review.