These do not appear to be Shrue Beta58a microphones. The price is great, but they are not as advertised. They don't sound that bad for a $40 mic, but they don't sound like Shure Beta58a mics. I am disappointed that eBay would allow such misleading products to be sold without proper attribution.
Vocal processing including harmony, doubler and effects is outstanding.
Guitar effects are a little weak. Support for impulse responses would be a big plus. But many people will likely use a dedicated guitar processor, in which case case the looper becomes more challenging to integrate.