Tried it fishing along a river / playing at a Toronto beach Ontario. With the directional stabilizer boat tracks straight & moves slower than a kayak but about the same as a canoe.
Tandem paddling is possible but a little cramped for a second person, waves & boat wake are easily handled.
For the solo angler this will get you further than a pontoon or belly boat, but the 380X will get you even further if you don't mind the extra length. The 340X just did not paddle as fast as the 380X probably due to it's shorter length which you think would compensate by having less drag.
The 340X is a very nice boat if you can resolve yourself to knowing that all you want is a tough little inflatable one person kayak that paddles like a canoe for the cottage, or beach, or for the kids, or something for fishing a small river or pond... or going down some whitewater... wait a minute, this is a nice boat. See my 380X review. An excellent general purpose kayak that you can take to the airport. Though at the airport I had to use a huge suitcase. Try that with a hardshell kayak. I've taken this at the ocean and at the lake with no issues. Only thing is at the ocean you have to unplug the self-bailing valves so when the waves bring water in the kayak won't get flooded. Plus at the lake you definitely need the optional stabilizer otherwise it's difficult to move without going side to side.
The material is real strong and is definitely not an air mattress. I've bumped into rocks and scraped over shells and it still handles it just fine. Definitely recommend it for a general purpose kayak.