I just bought a pair of those exact flashlights. Currently, I'm only using them for about 30 minutes in the morning during my commute. My return trip home is not dark yet.
I don't have anything to compare them to, but from first impressions I can say that I like them. They are bright enough for my needs right now. I have one mounted on my helmet and one mounted on my handlebars right now. In the near future I plan on getting another one for the handlbars.
I think the other thread quoted earlier says they last approximately 2 hours with the rechargeables. I JUST got mine last week so I haven't hit that 2 hour mark yet. Probably tomorrow morning =)
Like you, I didn't want to spend the money on the fenix. For the price, the Rommisens are damn good imo.