I have a double cross and it is a beautiful knife and well made. I am very impressed with the stabilized wood and the wood looks even better than in those nice pictures above and reportedly very durable. Either blade can be opened and closed one-handed (right hand only).
I am not crazy about the action on mine. The handle seems a bit small and narrow to allow a smooth, natural opening motion for me and it feels a bit unsafe to me when I open it. The blades kind of jump out of their detents and get ahead of my thumb. Maybe I am doing it wrong. I have another Walker lock knife that I can use fine, but they are my least favorite lock.
It also strikes me that the overall width of the knife is a lot considering that it is a 2-blade slippie. It just strikes me as fat and a bit of a lump in the pocket. But this is necessary because the locking liner between the blades prevents crimping them together.
And the steel is marginal in my opinion.
But again, it looks great and is well-made. You may love it. I have no experience with the Boker. There are not a lot of one-handed, locking traditional models.