Nobody has done a trireme report (at least not that I saw), so here goes:
The trireme was the Roman set that interested me the most.
The Good:
1) Modestly priced at US $40 - $60
2) Comes with a full range of Roman military types. Legionnaire, auxillary, Syrian archer, centurion, and legate/tribune
3) Floats! Give it a push in the bath and it sails like it was born for the water
4) Looks good, a nice-looking cartoon caricature of a trireme
The Neutral:
1) In water, the boat kilters badly if you don't evenly distribute your clickies on board.
2) The red flag on the mast is smaller and less interesting than the flags that come with other vessels.
3) The oars are advertised as being raise-able, but considering they only rotate one or two degrees, it isn't worth listing as a feature.
4) Supplies on deck are sparse (one wooden chest with two goblets).
The Bad:
1) The oars are simply a large piece of plastic clicked into the side of the boat. The oars can move up and down a degree or two, but you can't move them forward and back, which would seem to me the most fun. For detail oriented playmobil, it seems a little corner-cutting that they didn't design a full lower deck where you could actually sit people at the oars. As-is, the lower deck is a small compartment under the cargo hold door, conscripted in space by the shape of the place for the battery-operated turbine accessory (not included).
2) The stickers are very long and difficult to align straight. You can tell barely by the picture. I messed the left-hand side's curved region above the eye.
Trivia:
In order to float the boat uses a small piece of foam inserted into the ship's interior.
More Trivia:
Triremes were still being used during the middle ages for Mediterranean shipping, so this ship, with some changes, can be re-used for medieval (see my next post on this thread for photos).