Premier is the Ed McMahon company. They use a decent quality tub, but they are extremely high priced and the sales people they send out are very high pressure. Their base price is around $15,000 going up to about $ 30,000.
There are quite a few company's that have a lifetime warranty on the seal, however there are many that are junk. There's a huge lawsuit going on now where a company was selling them on E-bay and sold Millions of dollars worth and they never held water from day one!
I would recommend looking into Luxury Bath if there's one in your area. www.luxurybath.com
or 1-800- A NEW TUB. They have a really high quality tub at a reasonable price. The seal has a lifetime warranty, and if it goes bad they even cover the labor to replace it.