I researched both, I think my first post on this board was asking this question.
I know nothing about performance. I went with the V4L. For me, it came down to price.
They're both KR808's. With the discount that V4L offered, I was able to get the Ultimate XL kit with manual
batteries plus an extra box of 5 cartomizers for 49.55. The Bloog is $99.99. Double. I just couldn't see paying $100 for a KR808 for something I had no idea if the person I was buying it for would even like it (my mom).
The V4L has a 45 day warranty, Bloog I
think 30 days. Both are probably great products with good reputations on this board. I don't think you can go wrong with either.
Good luck!