its all just a metter of personal taste of each item - there are many own brand items that i actually prefer to name brands, just because of subtle differences in taste, or ratio of ingredients etc - its worth trying them just in case - its only a few quid and could save you a lot of money...
for instance i hate coffee and the only one i have ever tasted and found drinkable was a nicaraguan one from oxfam...
own brands are not crap - otherwise supermarkets wouldnt bother selling them...they are generally very decent
its kind of snobby not to at least try...if then you still like your old brand then fair enough, but to dismiss them outright as though they are beneath you does not make you appear classy, but rather snooty...