its a yes and no answer I think.... depends if are willing to change ur work flow. For me the biggest advantages for server was the, although still beta, support of 64bits.
As it has been well documented, 64bits has its problem with AITB license problem, and importantly the crashing issue.
I run Reaper 64, OSX 10.8, and Nebula server ... I had to drastically change my work flow to make it work for me...
1. to use AITB, I had a 32bit AU version setup just for this... and I run 64 in VST, which its only available to on OSX
2. crashing issue, I think someone on the forum mention it, and the work around was I had to work slow.. insert Nebula, I will press save, than select a program (usually this crashes Reapers) if it doesnt crash, save and move on... if it crash, re-lanching Repaer is relatively fast, after the re-lanuch it usually will be stable until u insert another nebula plug.
3. Freezing is also important to minimize the crash.. so once I have done the console tape thing as step one I will freeze and move on..
took a while for my to change and it was very frustrating.. but with practice I am able to get my mix time back to close to how fast I could mix. Of cos everyone has a different situation, I mainly do internet mixes for clients so I dont need to sit with them and mix, and hence I could work this way.
Let me ask you (right now I'm on Reaper + 10.6.8, but I'm moving to 10.8 soon), when you mentioned the crashes, are you talking about 64 or 32 bit version of Nebula? Running on Reaper 32 or 64? Thanks!