I hate recommending kit to anyone because we all use and abuse stuff differently.
Stevie, I've never used the Ikon's but I think the Koski's may be similar. The Koski's are the lightest waders I've used and also the best fit. More like scrambling around in a pair of lightweight hiking trousers but i think the relatively soft, light material wears well. I may have just been lucky with this pair.
James, thanks for the link to the boots. I use a similar pair on some occasions for wet wading, however, I spend most of my time slithering around on weed covered rocks and studded boots are a must.
I also have a pair of Guideline Laxa waders(bought in a sale!) which seem very well made BUT they are showing signs of wear after only a few trips. The material is showing signs of fraying on creases on the inside leg from walking. They do not fit as well or offer the freedom of movement of the Koski's so are now my back-up waders.
What we wear under our waders probably affects them too. I always wear Under Armour type compression leggings with an additional pair of stretchy thermals over them in colder weather. Again, very easy to move around in and wicks sweat away from your skin but is very kind to the internal seams on the waders.
On reflection, perhaps good fit and free movement that doesn't pull the seams is the secret to longevity.