Obviously I can't answer with your specific situation of a criminal record but applying for a Visa involves completion of forms, photographs and a visit to the US Emabassy which can be very time consuming. When we applied for Visas their main concern was that we were going to return to the UK and were not intending to seek work in the US. To this end proof of our home ownership, jobs etc had to be produced and they went under fine scrutiny. Back in 2004 the cost was about £160.00. The Visa last 10 years, if your passport runs out in that time you travel with your expirered passport, with Visa, and your new passport.

For us the decision was made on the day, passports kept and sent by courier about three days later. When you get to US Immigration you queue with everyone else, generally we are asked why we have Visas, how long we are going to stay etc etc but it has never been of any benefit, or otherwise, at point of entry into US, we are photographed each visit and finger scan taken.