I do most of my shot shell reloading for special loads. mostly turkey and slugs.
how is it comparable to off the shelf shells in price and pattern?
That depends on how much attention you pay to detail and how much you want to play with loads. as for price you have to include startup cost and supples. after a while this will even out and in time you will save quite a bit on "special loads" if you are loading trap loads you can find good loads cheaper then one can reload. patters will be different for each shotgun you just have to work to find the load yours like the best.
What reloader to look for
you can not go wrong with a MEC loader you can get a 3 1/2 kit for most of them.
IF you are not going to do a lot of shooting you may be better off just buying factory shells. Most people I know only shoot about 2 or 3 boxes a season they would not gain anything by reloading.