If your interested in one I say go for it.
I have a LG Burner myself, which you can pickup anymore for around $80. So far, its been a very good one and has recognized and read every BD Ive thrown at it, and has burned a few BD discs without problems.
My other one would not read certain BD discs for whatever reason (commericial discs), but from what I had looked into at the time it seemed to be a issue with some players on the PC and certain discs. Not sure thats as much of a issues these days though, but something to a bit aware of.
Sadly I do not know anyhting about the models your looking at, so cant say anything good or bad about them.
They are certainly nice to have, and the ability to burn a BD should you choose to is certainly a nice route to have. Although, the downside is that blank BD media is still on the expensive side.
So just keep that in mind as well.
Another thing to keep in mind is research the media types the burner your looking at will play nice with.
Some will only reliably burn to the more expensive discs (such as Verbatium) and others will burn to a wide variety without much complaint (even the cheaper ones)
Im sure you are quite aware of all this, just thought it was worth mentioning none the less.
Sometimes (at least for me) its easy to overlook the smaller details like this when looking for a new piece of hardware.
Personally, I wouldn't be looking so much towards burning speed as I would be how reliable they burn first, then speed as a second.