I've been running mine continuously, over 24 hours now without any problems. I was very surprised at the great fit and finish. Mostly CNC machined metal parts and very well constructed.
The engine is nicely done, very well and sturdily build. It runs smooth and is nearly completely silent. It is worth spending a bit more to get this model than the cheaper low temperature engines.
This is one of my favorite engines to show off, beautifully built with high quality parts. Such a simple design will have you gazing out appreciating how well it works. Really is nice and packaged good so no damage on arrival, great price too. I highly recommend this to anyone learning or just adding to your collection.
A very well made and enjoyable little toy.