I can't vote in the poll because I've not tried true 5v vaping. What I will say is that I'd been using my DSE901 for 8 weeks reasonably happily, was a 30-40+ rolly a day smoker (100 gms Golden Virginia a week) and gave up instantly!, apart from I was fed up of the rubbish batteries. I'd bought a 5 pack from TW and only 2 of them were any good so battery swapping was a nighmare and I was always woried if I was out for the night. So I decided to get myself a mod and ended up buying a 2nd hand Silver Bullet off of another forum member with all the batteries etc and 510 atty.
WOW! I'd heard 6v vaping was supposed to be harsh and I suppose it was a bit at first but I think that was because I was taking too much of a drag on it compared to the DSE901. I just love the 6v. The throat hit and the vapour production are just far superior to 3.7v and I just can't go back to the lower voltage anymore, despite trying.
People also say it uses more juice, which it certainly does, but I also find it increases the nicotine hit too so I would have thought the cost wouldn't be much more to DIYers because you can decrease the nic content of your juice thus making it cheaper again. I'm practically already down to 0 nic (started off at 18mg, then 11, then 8 and now just 4mg) now so amount of juice usage isn't really an issue for me anymore but maybe worth considering if you are on high nic content (though if you are I 'd suggest you try lowering it, you may be pleasantly suprised. I really think that the act of smoking is the most addictive part rather than the nicotine. I've had no trouble bringing the nic content down at all and I thought I was a pretty die hard heavy smoker). There is also atty's to consider. I've only had the SB a few days so don't know how long the atty will last being used on 6v permenantly. I'm keeping my fingers crossed on that score :-S
So I can't tell you what 5v is like but IMO 6v is wicked!