I had the 5m cuddy version back in 2005. It was alot of boat for the money back then. 35k got a fully painted hull, canopy, clears, 100 ltr underfloor tank, nice upholstered seats, fishfinder gps and a 90 merc which pushed her along to 40 mph easily.
Alot of volume for a 5m boat thanks to beamy design, so nice and stable at rest... but fine entry ment it rode pretty good. Could fish 4 people easily.
I had to lift thefloor (ply) to fix the fuel sender once and was pretty shocked to see the state of the underfloor metalwork. Thin gauge alloy slotted over longitudinal stringers with the odd spot weld holding it together. Looked very weak.
From there over time the bottom of the hull was deformed inwards due to water pressure on the thin gauged bottom plates, which I think was 3mm corogated to provide strength and aid tracking by acting a bit like a strake.
Granted we went out in some snotty conditions with dive gear so there was alot of weight in the boat.... But we were not exactly punching over a west coast bar daily. Just Hauraki Gulf. At about 90 hrs I sold it.
I think for what they are intended for ie: waterways, lakes etc they are fine.
Nz conditions are pretty full on some days, and I dont think smaller Quintrexs are built aswell as nz built boats. I have herd a few storys of owners dealing with cracked welds...and warrentys not being honoured. Have even seen statements online from ex-owners saying that they should not be sold in NZ
But... The boat on TM looks good. They nice inshore fishing rig. Just treat it carefully. They aint no AMF.