Hi! I am new to this site, but when I saw your post, I just had to respond. I am very familiar with Tate, and I'll tell you that it has its good points and its bad points. First of all, it's a hybrid publisher. That's what I've always thought of it as, and apparently what Sally E. Stuart calls it. (I'm sure you already know this, but just in case, she publishes Christian Market Guide)
Tate would probably take issue with that label, but I think it is a compliment, because it means that Tate is somehow more than a subsidy/vanity press. But it is simply not a traditional publisher, because you have to invest your own money up front. That's the trademark of a vanity press. Period.
Now for the good part. If you look at Tate's website and see the staff... they are good people, at least the ones I know. They work really hard and they really care about doing their jobs well. Almost all of them are hired right out of college and they are "hungry" -- which is a good thing. They aren't bored or hopefully not yet burned out; they are excited to be editing, or designing book covers and they bring all they have to the table.
A big difference between Tate and a pure vanity press is that Tate works really hard to sell books. They spend lots of money on advertising and try their hardest to get bookstores to stock author books (which is really hard, and FYI, no bookstore chain stocks POD books. So again, you see that Tate is a hybrid). Their Marketing team is made up of really nice people who try so hard to do their jobs well. HOWEVER. At this point, Tate just doesn't have a strong marketing arm. Walk into a bookstore and try to find a book published by Tate. You probably won't be able to find a single book with their red logo. The only exception is if a local author has recently had a book signing at that one store. You might find one or two copies of that particular book. That's the bad news.
You just have to weigh your individual situation and be realistic. Can you afford the author investment? Even if you get nothing back? Is this the way you want to publish?
Tate will do the best it can, but as far as selling your books (and then earning back your author investment) it will be up to you. Some people can make this work. Most don't. People who do public speaking have the most luck -- look at Rick Warren, he self-published "Purpose-Driven Life" (note with Tate, btw). And "I Kissed Dating Goodbye" was originally self-published. Both these men were totally on their own and made it work. Tate will at least try, but don't get your expectations too high if you go with them.
You'll get good people, a full edit, and a really good-looking cover. (With vanity presses, I think you get a book that looks homemade, not professional.) They'll try to help you market it, but you're mostly on your own. That's the honest truth of the matter. For some that's a good fit, for others it's not.
Best of luck!