I know there are loads of people on here who love it, and I used to buy it for about 18 months, but the last batch I had they just turned their noses up at it.
I spend a fortune on Timothy hay as mine all developed the taste for it, but with hindsight I would have kept them on the £3.50 a bale stuff as I'm spending several hundred pounds a year on Timothy Hay alone!
If you can get decent bales of hay, and your rabbits eat it, my advice would be stick to it, and just give them maybe some oat hay or Timothy hay as a treat or for a bit of variety.
The DFH, at the end of the day and IMO, is £40.00 for a £3.50 bale of hay that has had the dust removed.