I tried to order the 1620 recently but they are no longer importing that machine but still have it on their web site. I placed an order for it anyway and Boss Laser upgraded me to the 1630 at the same price as the 1620. I really like the 1630 but would have been happy with the 1620 if it had showed up. I can't speak to the 1620 but the 1630 is a very solid machine and I'm very pleased with the machine so far