I posted similar question some time ago, but this was regarding their Aspen tyres, eXCeption series. And I had no luck with it, even with a compressor and with a “tubeless-experienced” friend’s help. Tried the innertube trick, all the tricks with the tyre lever… It just didn’t work.
Got the TR Crossmark and it went up straight away, with a track pump – even without any attempt of pre-seating the bead! (it was the same wheel!) So from my experience it is worth to pay a bit more for TR rubber, to avoid disappointment and money wasting.