@Vision40 , I've personally made around 1" gains in length and girth, trying to get back to more vigorous training. But those gains have stuck even with longer pauses!
I feel the Bathmate / Hydromax works very well in the shower as well. Especially if you have a shower "cubicle", you can have a small seat and just relax in the shower booth, doing your session. I haven't tried the Hydromax in a bath actually, overall I feel baths are a big waste of water when you can get cleaner using the shower.
Just a personal opinion, where I live bathtubs haven't been so very prominent ever.
And anyway, I prefer sauna when it comes to heat, those are more common here in Scandinavia.