Yes, they are a good, reliable company. I have ordered from them, too.
My only complaints about Bass:
1 - They put 16 gauge wire on the floors of their cages. I will buy from Woody's Wabbits or Klubertanz from now on for cages
2 - If you want to order just a few small things, the shipping is hideous. If you are ordering more than that, it's quite reasonable.
I have their 2-liter bottle kits, and really like them. I always had so much trouble with bottles dripping out before I could refill them again in the summer, until I got these. Don't over-tighten. Tighten until it stops and is good and snug. I have way more leaks if they're overtightened. You do need the gasket. A garden hose washer of that size will work, as well.
I stretch the springs out some before I use them. Some people use two springs.
Some rabbits take time learning how to operate the things. You may need to leave a regular bottle or crock in there while they adjust. Take the other source of water out for a few hours during cooler temps (not in the middle of a summer day), to encourage them to try out the new bottle. Sometimes, I've sat there and moved the little button myself, to show the rabbit that this new weird thing contains water.
It is definitely worth the trouble, because they don't drip out. Most rabbits learn it quickly, too.
My one last holdout, our first bun, finally learned how to use the thing recently. You can teach an old rabbit new tricks. Okay, so he's only 3 years old...