I got them from Disney because we bought a package, and it seemed like less of a hassle for me, but I know the LMT ones are (were?) slightly cheaper still. I would assume they offer the same as Disney does, but you should check that. They mention "8 locations" at the top, but then only list two in the description

, so something's not right there (but Disney's website lists 8 locations for resort dining vouchers, which is what leads me to believe they're the same). A quick email to them should clarify that.
But from Disney, PCH is regular, not premium. From their website today:
Applicable Resort Dining locations include select Character Dining or Table Service Restaurants at the
Disneyland® Resort. Character Dining locations include: Plaza inn on Main Street, USA - Disneyland® Park; Celebration Roundup and Barbeque at Big Thunder Ranch - Disneyland® Park;
Disney's PCH Grill - Disney's Paradise Pier® Hotel; Storyteller's Cafe - Disney's Grand Californian Hotel® & Spa. Table Service Restaurants include: Cafe Orleans - Disneyland® Park; Carnation Cafe - Disneyland® Park; Wine Country Trattoria - Disney's California Adventure® Park; Steakhouse 55 - Disneyland® Hotel.
Premium Character Dining locations include Goofy's Kitchen at Disneyland® Hotel (serving breakfast, lunch and dinner) and Ariel's Grotto at Disney's California Adventure® Park (serving breakfast, lunch and dinner).