MIG15 Consumables?

Noticed there are heavy duty contact tips for the 15 torch handle. Besides the the obvious (HD) any pros or cons using these tips? Have a I MIG 200 that I use it mostly for sheet metal work but welding bigger stuff as of late (1/4" steel). Any feed back would be great!

Thanks,
GTig

The tips are interchangeable with TWECO. They also have heavy duty tips. They don't overheat as quickly.