I have used Parker's once for my own transmission work, but have recommended them to others several times and heard back nothing but satisfaction from my friends that have also used this transmission shop.
The thing that I have always appreciated about this shop is that they are real with you, they will not beat around the bush, you will know whether your tranny can be rebuilt or if you need a whole new transmission. You can trust the workers here and know that you are not going to be ripped off.
This shop has been passed down to the second generation of Parker's and is family owned and operated so flawless workmanship is what is expected from the facility.
Please call ahead before going because the shop is always busy.
I suggest you at least give Parker's Transmission a chance to give you an estimate for your future transmission needs.