The Sun Dolphin Bali 13.5 Tandem is an excellent value. It tracks well, even into significant winds, and has excellent stability. It light weight is appreciated, especially is you have to roof it for transportation. I've used it for about 10 miles on rivers and lakes.
Of course the price and weight do show in it's construction. The body side panels are the most flexible of the four kayaks I own. There is no noticeable flex of the body when loading or using the kayak, just some flex of the side panel when pressed on to enter or exit. The lightness of the body plastic may also affect it's sunlight/UV protection. Only time will tell if these factors will affect it's long term durability.
The seats are comfortable and adjustable, but for more than an hour or so on the water a gel pad would make for a more enjoyable trip. The compartments by each seat, bottle holders and paddle holders are very handy, and surprising at this price range.
A major problem is the placement of the foot pegs. There is insufficient leg room for an adult front passenger. I have removed the foot pegs, allowing foot placement on the front portion of the kayak, but now it's a little too long. The manufacturer has supplied new riv-nuts for re-installation of the foot peg tracks, but it's
something that should be rectified at the factory. The rear peg tracks and also very low, causing your foot to press on it's arch, rather than on the ball of the foot. Not a problem yet.