对于大规模Java数据网格技术，您会推荐什么：Terracotta，GigaSpaces，Coherence等？

I've been reading up on so-called "data grid" solutions for the Java platform including Terracotta, GigaSpaces and Coherence. I was wondering if anyone has real-world experience working any of these tools and could share their experience. I'm also really curious to know what scale of deployment people have worked with: are we talking 2-4 node clusters or have you worked with anything significantly larger than that?I've been reading up on so-called "data grid" s