I purchased a pair of the Harkila Forester 17" zip 5mm neoprene. I greatly appreciate the convenience of the full length zip and warm and comfort of the boots. Equally, despite the high cost and quality sole, the design does rather give the appearance of not being able to stand up to 'hard' wear. Being mindful of this, I have taken great care not to use them for purposes and in areas that I would judge to be 'hard' wear. Instead, for what I consider to be 'hard wear', I wear walking boots and gaiters.
I have had the wellies now for 18-months, during which I have covered over 200-miles (I keep track of the distance I cover in all of my 'sporting' footwear using a Garmin sports watch) over farm land and they are still going strong. There have been odd occasions I have gingerly stepped through brambles or hawthorn and I guess I have just been lucky not to tread on any thorns big enough to puncture the sole or uppers.
Liking the design, a good friend of mine also purchased the same wellies. After covering a thousand miles or more walking his dog twice daily across farm land over 12-months, they developed a split on the toe. This is seemingly a common complaint judging by the responses to similar threads over the years. Uttings replaced without quibble, although I would personally question whether the issue was caused through reasonable wear and tear or genuine product failure, especially since the soles were almost worn through too.
Frankly, I wouldn't personally expect these wellies to last very long under the same type of volume or type of use that walking boots are more specifically and appropriately designed to cope with. Interestingly, and despite his first experience, my friend still appreciated the design and construction sufficiently to have Uttings send him another pair in replacement of his first pair, rather than any alternative. Now also more mindful of the limitations of the product, unless properly wet, he too now opts for his walking boots rather than the wellies.