Nude Nicotine offers some of the cleanest DIY nicotine available. It has been compared to another well known lab's limited offering of ICE. Each batch is individually tested with COA available. They also offer a complete line of DIY supplies, some are not available elsewhere and they are what is used in labs. They also offer nicotine packaged for long term storage called "Armor" which is in glass and topped with argon.
They offer a line of pre-mixed eliquids and their flavorings which are PG free. Nude Nic's owner is a chemist and they are doing their own extractions. The owner is responsive to emails, Facebook and he has a DIY show on Vape TV every Monday that viewers can call to ask questions. I've asked him a number of additive related questions and he's responded both in plain english and provided complicated studies. This is a good supplier for anyone who wants to know more about eliquids.
As far as eliquids, I'd reccomend going for their premixed. I've expericed some seperating in their flavorings and think it's best to leave the mixing up to them. What I can say is they offer some flavor profiles that can't be found elsewhere; one of the stand outs is their Mayan Mocca which is a spicey chocolate. Another surprise is their Pachoulli Vanilla which is very earthy and compelling even if "earthy" flavors are not your thing. Overall I'd say their flavors are directed more to a mature taste and not focused on overly sweet candy like flavors. The tobacco's they have are well chosen, only featuring 2 but both are highly worthwhile.
Overall, that says it for Nude Nicotine's pre-mixed flavors. They aren't interested in offering every flavor possible, just the ones that are worth it. I have experienced a packaging problem and NN got back to me within 24hrs, sending a replacement no questions asked. They also took the hint and upgraded their packaging since then.