Yes, pedigree is of no interest to us but we mostly use purebred tups.
Our ewes are crossbreeds - well, mongrels, really, but bred with purpose - so we feel it better to keep the variation on the tup's side down to a minimum.
Having said which, we have previously used and this year are using again a tup which is part Beltex part Texel. Very similar parents but not identical.
And last year we used a 1/2 Shetland 1/2 mongrel tup lamb on a few smaller first-timers, just to see, and to give them an easy first lambing and because we are very happy to incorporate Shetland characteristics into the commercial flock.
Two of the ewe lambs are perfectly acceptable for our purposes, and have nice fleeces
The male lambs were also quite acceptable - but we did get more variation than we would be happy with on a grand scale.
If this year's 100% (pedigree as it happens) Shetland tup leaves good lambs from my fleece sheep, and behaves himself, he may get to tup a few commercials next year
But I doubt if we'll use a mongrel tup on the commercial sheep again, however nice he is himself.
Deliberate crossbred tups of similar breeds do however, remain of interest. The Beltex/Texel, Texels with a bit of Dutch Texel. Personally I'd be most interested to try a Beltex/Charollais but BH isn't keen.
We don't want our lambs any heavier or heavier-boned, so the SufTex would not be of interest to us.