I have a Polycraft 300 Tuffy.
Probably its greatest advantage is its stability. Absolutely fantastic in that regard, and the adverts are to be believed.
Another advantage is tough. But being plastic, it does no damage to the hulls or paintwork of the yacht.
Plus throwing scuba tanks
in, or spearguns, is of little concern.
An extremely practical tender
in this regard.
However, there are some drawbacks...
It is not light. In fact surprisingly heavy. Davits
need to be substantial. I doubt it would tow behind very well (see below about wetness).
If it sits sideways on the edge of the beach, waves slop over the side (or rear) and swamp the internal area. Right to the top if left long enough, but it will still float. Obviously pulling it up the beach would prevent this, but did I mention it is heavy? When going ashore, being mindful of the tides is a good idea to prevent either being swamped or stranded.
The steps on the rear of the pontoons are great for in-water access when diving
etc, but make it difficult to mount dinghy
wheels for portage. I have mostly got around this by carrying 3 or 4 1m sections of 100mm polypipe to act as "wheels" or roller-bearers.
I have a 15hp short-shaft outboard
. There can be significant cavitation of the prop at higher revs or choppy seas. A much larger anti-cavitation plate reduces this.
Choppy seas can make for a very wet ride. Low freeboard plus the excellent stability from the bow buoyancy mean significant spray coming over the front and sides.
I'm still waiting to find the perfect tender!