I own one of those Dennison reels and I think it is not good for a whole lot of anything. The reel is so small it hardly holds any line (it wouldn't hold an entire 3wt line), what line it does hold comes out in tiny tiny coils, and the reel has almost no leverage for fighting fish again due to the small diameter. The reel doesn't have any drag, which is OK for ultralight reels, but the spool doesn't have an exposed rim for palming so if you hook a big fish, you can't play it from the reel.
Orvis Battenkill Barstock 3.2 ounces for the I size, 3.5 ounces for the II size. Smooth disc drag, machined construction, exposed rim for palming the spool.
White River Fly Shop Classic "Ultralight" 2.2 ounces, click and pawl drag (not adjustable), but the reel has fully machined construction and an exposed rim for palming.
Both are about $90 and very high quality fly reels.