This is wierd (but seems to be typical of this forum in particular for some reason): The OP asked for opinions on NEW 4-stroke 5-6hp outboards, but 90% of the replies talk about how to repair his old one.
I have a nearly-new Tohatsu 6hp 4-stroke. It's light (for a 4-stroke), runs great when it runs, but has some kind of problem with getting fuel. Last time I took it to the dealer, the problem was apparently the fuel HOSE (nothing to do with the engine itself). The engine itself seems to be (relatively) well-built and reliable.
I also had a brand-new Merc 9.9 4-stroke. It was VERY smooth (especially at idle - you could barely notice it was running), but very heavy. As long as you obeyed the rather complicated starting procedure (that was NOT in the manual) it started and ran fine, except for a big hesitation if you throttled up slowly.
Basically I'm not overly impressed with the new engines - they do not seem to be much more reliable than the old 2-strokes. OTOH, they smell MUCH better!
druid
"Wind Drift" Ontario 32