That one will work fine. less cost means longer to get a reading and to some degree, accuracy but not so much that 99% of people will notice. Most go a lifetime without a Thermopen, so don't sweat it. That one you list is not meant to stay in during cooking.
The Thermopen comes into its own in a production environment, when you need to probe many pieces of meat and get the oven shut ASAP, or if you have money to burn.