Hi, eric1975. I just bought an all-black 0300, but it's the new black G-10 version from ZT, not the special order carbon fiber one that TAD Gear sells. If you're worried about spending so much on a knife that you may not be absolutely wild about, you could (a) buy the standard black G-10 version for a lot less than the one at TAD Gear and (b) buy it from a dealer who has a generous return policy in case you're especially disappointed and want to send it back.
When the 0300 arrives, you may not be absolutely wild about it, but I can't imagine you being disappointed if you like what you've seen in pictures, if you're impressed with what you've read, and if you like solid, bold knives.
To be honest, I haven't been able to carry my 0300 as much as I'd like because I work in a place that wouldn't take too kindly to employees carrying what many would consider to be more of a concealed weapon than a pocket knife. I tried carrying it loose in the pocket of my khakis without using the clip so it wouldn't be visible, but it's just too heavy and large to comfortably carry that way (but I don't doubt that some determined individuals manage to carry it like that!).
As for the size, it's definitely larger than your typical 4-4.6 inch pocket knife (e.g., Benchmade Griptilian, Kershaw Blur), but it's not so large that you can't carry it on a daily basis, though it may take some getting used to. Personally, I don't notice its substantial weight when it's clipped in my pocket. In fact, it's the substantial---but not excessive---weight of this knife that makes it feel so solid and durable.
Not to put down "lesser" knives, but after handling my 0300 for a while, my other smaller pocket knives felt like little letter openers or something. If you already have at least one quality pocket knife in the 4 to 4.6 inch range, but you want a larger, solid, hefty knife with a very secure lock-up, I'd recommend the ZT 0300. I'm quite happy with mine.