First of all thank you so much for your hard work. Synology is great product and I think this community will make it more popular. I just wanna share my experience with this product.
I have 1 Synology (409+, 4.2) and Xpenology (4.3, based on Trantor's build) .
409+ still works as expected. Never had an issue with this box in 3 years. But it is time for replacement and it will be DS1513+.
Xpenology based on LianLi PC-Q25, ASUS H87I-PLUS and 4 seagate drives. It is full functional test box for my Xenserver lab. I also tested WOL and HDD hibernation, no issues.
I wanted to play with v5.0 and decided to install it on Xenserver 6.2 host with pci passthrough and was surprised by performance. Latest gnoboot 10.5 didn't work (Xen paravirtual support does not boot!?), but 10.4 works perfect. I have xenserver host patched with e1000 and vm gives me around 90-100MB/sec transfer speed. If anybody will be interested in running Xpenology under XenServer then I'll post step by step guide.