I think it's personal preference. Some people say EW's are a waste of time, some say they're a good thing. I could go either way, it just depends on what item you have. If you have an older CRT RP, then I'd say yes due to the fact of convergence issues, and more moving parts. I had an old Sony 51" TV that I had flicker, A/V input, and bad CRT issues, so I was glad I purchased the EW.
LCD wise, they have less moving parts, so that's not much of an issue.
I have been quoted by local dealers that if you take an LCD TV out of the box and set it up, and it works fine, you're most likely set. If it is going to have issues, it will out of the box or during the manf. warranty.
If BB does not cover bulbs up there and you would like an EW, I would recommend going directly through Sony. Their warranties are cheaper than buying from CC or BB. Plus, you can't go wrong buying directly from Sony.