If you are considering price, the Depth and JL 110 are a closer match. Has anyone use both?
I own a Depth i coming from an SVS SB12-Plus, and it's quite a subwoofer. I've demoed the F110 several times at different dealers and it's a nice little sub, but to my ears, the Depth i seemed to extend a bit deeper than the F110. While I can't do an apples-to-apples comparison since the subs were in different rooms at the time, output wise, it's pretty close. It's quite amazing what those three 8" drivers can do.
I was initially lured towards the Sunfire subs because of their diminutive size and prodigious power, but having read dozens of reviews, talked with actual owners, and then demoed the True EQ myself, I walked away unimpressed. Like a few others here mentioned, it definitely sounded "muddy" and boomy on all occasions when I demoed it in different rooms and on different source material. Also, the 2700 watt rating is deceptive, since the driver only sees maybe 200-300 watts max according to Carver's own whitepaper.
Either way, I'm 110% satisfied with the Depth i. I got mine on Audiogon from a local seller for an incredible bargain and it was in mint condition. It's easily the best true subwoofer I've ever owned, and one of the few subs I've heard, other than the Fathoms, that sound great with music yet still play powerful and deep enough for a true sub-bass movie experience that will give you the "room-lock" bass feeling.
I highly recommend the Depth i, especially if you can find a used one.