So they are plastic bottles..... answers my question because I have enough for 5 years so I would have to add the cost of glass.If you're purchasing in large enough quantities that it'll last you more than 6 months or so, you should be in the habit of transferring the nic you purchase into glass bottles for long term storage.
The later question depends a lot on the sensitivity of your palette, and what nic level you use. And also your level of curiosity as to what you might be missing from trying a different brand of nic.
Thanks