how does this compare to the happy hacking keyboard pro 2??
Shape and key touch mainly.
The first one's obvious and I like both the shape and the layout of HHK Pro2 better than those of Realforce (though realforce 86 closes the gap).
For the latter, Realforce is said to be a bit lighter and smoother to type on (all-30g version of realforce is even lighter). Also, realforce keyboards probably would last longer.
I tried both keyboards myself, and I personally prefer Realforce to HHK Pro2, mainly because I like lighter, tactile key touch. But some people like heavier, more solid keys, in which case they would choose to have a HHKB pro2.
It is unquestionable that both HHK Pro2 and Realforce are superb keyboards.
Which one to pick depends on one's taste-- well, for the most part.