It's a great knife. One of my favorites (in fact, I own two!). If you want a solid, heavy duty, reliable folder that isn't huge, you really can't beat the D'Allara. The blade shape is awesome, the lock system is rock solid, and it just feels beefy. It's a lot more knife than it should be for it's size. For a knife with a 3.5" blade, once it's in your hand, it feels like a knife with a 6" blade. It's also one of the most comfortable knives to hold that I've found. You could work with it for hours, and not find mind. That's unlike a lot of other knives that I really like, and even carry regularly, but tend to get uncomfortable if you have to use them for extended periods of time.
The one and only downside is the weight. When you've got a knife this solid, it's going to be a little heavier than some comparable folders. For example, my normal Every Day Carry (EDC) knife is a Spyerco Salt 1 (which, if you look at the blade shape, is rather a lot like a smaller, lighter weight, rust-proof variation on a D'Allara) weighs 2 ounces. The D'Allara weighs in at 5.1 ounces.
Congrats on a great purchase. ;-)