Yes they are a reputable vendor but kits are a waste of money. You will learn absolutely nothing if you pay for pre-sterilized jars. Vendors love selling stuff to lazy people but honestly the recipe for PF cakes is stupid easy and you don't need a PC:
2 cups vermiculite
1 cup water
Mix well and then add in:
1 cup brown rice flour
You probably need to order fresh spore. Monotub grows are not all that much more difficult than brf cakes but if you fuck up it's more devastating a loss due to the higher material cost of spawning to bulk. Of course you also need a pressure cooker to do grain jars.
If you got a PC and have done cakes already search the shroomery for grows from wild bird seed (WBS). You can innoculate WBS with a syringe directly although agar is the standard. This link helped me a lot:
https://www.shroomery.org/forums/showflat.php/Number/19792837