I used to use Finish tablets, but switched to own brand because of the increasing cost and because there wasn't much distinction in results. However having tried these I may well be persuaded back to buying Finish. The results on glassware particularly are very good.
The convenience of just dropping a tab into the dispenser without unwrapping it is balanced out by a need to keep the packet airtight, otherwise they start to dissolve.
Very good results, I haven't yet had to rewash or rerun the dishwasher because an item wasn't clean first time, so from that point of view they are quite economical.