Sorry it's taken so long to get onto this. Life has a way of getting in the way of things. I've finally had a chance to install each block on an Edge bridge and shoot a short demo of each block with a simple riff and simple lead phrase played to show what each block does for your guitar. I've got to edit the files and get them up on YouTube and my blog, but they will come soon.
The blocks fit nicely, just like a stock Ibanez block. The spring locks allow you to install up to five springs while still utilizing the lock, unlike the stock Ibanez unit.
The brass block added a slightly bigger warmer tone with a bit more clarity. Just as I've found with other manufacturers blocks. Sustain is a little better too. What the brass does is it kind of compresses the tone, which in turn makes it feel like there's a bigger sound since it's all much more even. This helps with the sustain too.
The Titanium offers a slightly brighter tone over the brass block. You get a bit of an increase in clarity. Compared to another Ibanez with the same woods (but with an Edge Pro with brass block I have installed) you can hear the differences playing them side by side. Unfortunately I didn't have two RGs with Edge trems and the same woods to compare acoustically, but i think the construction of the Edge Pro is similar to the Edge, and it's a decent comparison against the titanium on the Edge bridge. Acoustically you can hear the difference quite clearly.
The design on the Hantug blocks is more like the stock blocks though, so you won't get the pull-up issues that are sometimes present on some of the other aftermarket blocks. They have wider dimensions where possible without affecting usability, so there is more mass.
I'll get the quick demos up on my blog once I get a chance to finish editing the files, but if you are interested in trying these blocks check out Hantug Custom Guitars.