It isn't clear at present how to decide whether a given patient should use a pump. Unfortunately, no studies seem to have been done since the mid-1980s, and it is likely that the pumps and pump therapy have become much more consistently successful since then. A pump takes extra effort and attention. If you aren't already familiar with intensive therapy, think more than twice before jumping for a pump. You should probably try intensive therapy with multiple injections first.
Pumps represent a nontrivial capital outlay.
If you don't have insurance or other public programs that will pay for the pump, you will need personal financial resources. Most or all pump manufacturers allow a trial period, so you can try a pump without financial risk. You will probably know fairly soon whether you want to continue with the pump.