They are difficult to install but all headers are going to take some time. Not only do they cost 1/7th the price of TTis but you don't need a $125 starter to boot.
what tti headers are you talking about that needs a $125 starter? only ones that i know about that need a special starter are the early a-body ones. i know my small block 71 dart tti's can use a stock starter if i wanted to.
i've run headman and hooker headers on my dart in the past and man do they fit like crap compared to my tti's.