Press Fit Bottom Brackets

How bad is that plastic thing Shimano call a bottom bracket?
Yes they are cheap, is that because they need to be replaced every 6-8 months?
Never had these problems with outboard bottom brackets, just clean and forget, last forever.
Time to replace again, just interested in what other people are using as alternates?
Anyone using a Wheels Manufacturing alloy bottom brackets? Looks good, alloy body and a choice of different type of endure bearings, depending on what you want to spend.
Cheers