Recommendation for gray water pump for basement half bath? Saniflo?

bipbap

I'm looking to add a shower and sink to my basement by adding a pump to pump the gray water up into the main drain stack.
It just needs to pump it up about 6' but I want one that will keep up with the constant flow of a shower.
It's for a basement guest room so it won't get a ton of use, but I want it to work well when it needs to.
Any recommendations for this type of pump? I saw there is one from Saniflo but the reviews were mixed. I'd love to hear a recommendation from a pro.
Thank you!