I use 100 mg/ml and dilute to my preferred nic level. Some may avoid 100mg/ml as there is a safety learning curve which can be real concern with young children in the house. Others may not want to be bothered with the math to accurately dilute the nic. The EjuiceMe Up calculator takes all the guesswork out of getting the formulas correct.
MFS is a popular brand of nic. It is known to be peppery with
throat hit. There has been some reported inconsistency from one batch to the next. I am at the opposite end of the nic spectrum as I want the nic to be invisible, smooth, no taste, no odor, no
throat hit. I am using Xtreme
vaping nic which is pricey. Nude Nicotine Armor (for long term storage) is on the way with a Vapers Tek sample to be requested, from Bull City Vapor, when it is back in stock.