We purchased an Achilles LT-2 inflatable dinghy two seasons ago. After two seasons with this dinghy, we really like it and it has served very well as a tender for our coastal cruising uses.
Dimensions are: Length: 7' 4", Beam: 4.0', Weight: 40lbs, Load Cap: 690 lbs. Tube diameter is 13". Two inflatable chambers.
Advantages: Relatively light and holds two adults comfortably; Inflates and deflates easily and quickly and is easily stored in its carry bag. I have found the dinghy quite secure and stable, even two people aboard in rougher water.
Disadvantages: I would not want to row long distances in this dinghy, especially against a stronger headwind or tide. ( Note: A small outboard of 2-3hp would probably be a help when using it in larger/more exposed anchorages). Also, one needs to be more careful than with a hard dinghy on rocky shores/beaches.
Since the dinghy is a continuous tube, including the transom, this dinghy does not have self-bailing capability, from the factory. When towing the LT-2 in rougher weather, the wind can blow it around quite a bit (even against the hull). Also, water spray or rain can accumulate in the dinghy, making it heavy and hard to tow and very difficult to lift/drain out the water. We have avoided this, by: 1) having the dinghy tied upside down on the foredeck on shorter passages, or 2) deflating and stowing the dinghy, either on the foredeck or below, when making longer passages in rougher weather. Since it can be quickly inflated and deflated/stowed (<10 minutes, each way), this is not usually a problem.