Well, some people claim that the term is an oxymoron (Ajahn Brahm?). Because to be able to attain the state of jhana, requires some degree of letting go of self proliferating. That jhana is a kind of free-falling which once initiated, leaves little to attach to. Piti, sukkha etc. are seen to arise and pass.
Others claim that the "bliss states", and beyond, can provide a false haven, or temporary refuge where the notional self can choose to hang out.
Hence "jhana wallah".
I think probably the only resolution to this argument is to test it.
Saying that, I did find this book to be worthwhile.. http://www.amazon.co.uk/The-Experience- ... 999&sr=8-1