Competent and fun, though a bit flawed.
As a child of the '80s, I loved the Double Dragon arcade games. A pizza place had the first one set up to give you a ton of credits for a single quarter--the only way I ever made it to the end, LOL. I had limited exposure to Double Dragon II, though I played the heck out of the NES conversion/remake. I had next to no experience with the third arcade game.
The price is definitely right for Double Dragon Trilogy, and if you're a fan of the series, you're not likely to be too disappointed. All three arcade games are here, though Double Dragon 3 is easily the weakest. While the character graphics and backgrounds themselves look good, the animation is much choppier. Double Dragon II is my favorite, though that may just be more my personal preference. I like the enemy assortment in it better. On the whole, the games themselves are just fine.
Where the trilogy falters is in the presentation and setup. While there's nothing intrinsically wrong with the redesigned HUD in-game, the vibrant style contrasts with the grittier color scheme of the games themselves. Also, given the substantially different control scheme in DDII, each game should have its own controller configuration menu. It takes trial and error just to figure out how to configure Double Dragon II, which also affects the other games. Also, the game does not save your Easy Controls preference, so you have to reconfigure it every time you play. That gets extremely annoying. I've even had some issues with it saving my control scheme in general. Additionally, there DESPERATELY needs to be a command list, if not a full-blown instruction manual, for Double Dragon 3, as it's virtually impossible to figure out on your own, especially how the shops work in this emulation, since you don't exactly insert coins into your PC to purchase things...
That said, it's still great to have these classics on the PC. The flaws aren't deal-breakers, but I hope they are fixed in future releases. A good collection.