: Has anyone out there played the b-bender teles?
: Do they stay in tune?
: Does anyone know how these units compare to the Parsons White string benders?

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I have never heard of tuning problems like you have with those "floating" tremolo things. There are many kinds of benders on the market now, and I believe all have adjustable and positive, effective stops for both the Up and Down string positions.
To see (and hear) a version that resembles a HipShot (more like the Will Ray HelleBender, actually), have a look on the "Twang Page" after you get to this web site URL:
go.to/KC5JK
(with some browsers, you may have to enter: http://members.tripod.com/KC5JK.1/go).