I ordered a fairly large batch of 60mg/ml in both 100% PG and 100% VG last week. Packing was flawless, as it really should be when you're transporting bulk nicotine. They are only the fourth nicotine vendor I've worked with, so take my opinion with a grain of salt.
Their customer service has been extremely responsive. They were able to pack my order in a smaller bulk rate box than expected, and applied a partial refund against shipping nearly immediately.
What you want to hear about is the nic, obviously. I worked with it in a well-ventilated hood type area, for dilution. The liquid is extremely pale amber, nearly clear. (IMO, oxidized nic has a distinct color, and this is not it.) It appears clear at 24 mg/ml dilutions and below. The odor at high concentration was (obviously) acrid, but still pleasant; it's clear that it's an organic extraction.
I've used it in a number of recipes since receiving it, from 12-24 mg strengths. The flavor is not noticeable, even in mild creamy flavors (I've had peppery nic blow out chocolates before). Throat hit is solid without any pepperiness. My wife gets a "bleagh" response instantly to any unpleasant flavors, and has no complaints with the mixes I've used it in.
Overall my experience has been excellent. In my eyes this is a quality product at a fantastic price. Hope that helps!