In answer to your question - we have been using the B12 oils for about 2 years. They're cheaper than any sublingual alternative once you take into account the superior absorption, the slow release, and the lack of damage to the teeth and gums.
We also find the bottle not too expensive - about $40 for 60 doses (which lasted us 2 weeks initially, but now goes a full two months). And, for once, it's a chance to buy something made in Australia and not pay the usually outrageous transport costs from overseas.
Every now and again, we seem to need a massive hit of sublingual adenosylB12 - like 5-10 in a day. That's happening very rarely now. I'd guess it is something about Freddd's CSF-penetrating dose, but that would be a guess.
I personally use the B-group oil every now and again. I tried it at first because I'm the mum of the sick son, and that's what mums do. But I liked the extra energy and the reduced need to stuff my face at work.
As for Greg's manner (if it is Greg) - he's an Australian scientist, and he communicates as every other scientist I have ever worked with. He's very interested in the science, and in how it helps people. Australians don't do customer service the same way as other countries (we never said 'have a nice day' until American movies came here), so i guess you might regard that as offputting if you weren't used to it.
Hope that helps.
I was thinking of trying the multi B12 oil but it is very expensive. I don't know who is replying to their customer service emails at the moment but they seem unprofessional and off-hand. Surely not the Greg everyone is talking so positively about? Whoever it is doesn't sign their emails by name,
Anyway, I would like to know if anyone tried the B Group oils. It would save me from having to take so many pills. Has anyone here tried the B group oil?
By the way, I have found some good liquid B12 that I use sublingually or add to water that seems to be good for me.
http://www.epigenetics-international.com/subcategory/23/167/Liquids
I have only tried the adenosylcobalamin but I like it