The dish got lower gain than a solid 1.8m dish due to the fact the the IRTE is made of petals, the lower gain is not much taking notice to.
IRTE makes good dishes, petalized dishes have their positive sides as well, easier to transport and repairing if something happens.
It's a good dish no doubt, been with us a while now since 15 years back or so, got good track record for quality.
You can extend the dish you have by buying exension panels from IRTE to make it 2.4m if you are in need of more signal.