Just in case it helps with your decision I want to share last night's experience with the Istar 127mm f/5.5 objective equipped binocular telescope. I was cruising around at 38x with a pair of 18mm eyepieces having a fine time. I decided to take a look at the Double Double. I could not see a clean split so put in a pair of 6mm eyepieces for 116x. Nice clean split on both pairs. M57 is just down the street so off I went.
I was considering calling it a night and noticed a bright object just east of south fairly high in the sky. I haven't been out for a while so I'm thinking Antares. I swung around, saw a disc and thought I must have bumped something to get out of focus. Then I realized it was Jupiter. Very pleasing at 116X as was Saturn nearby. Everything looked promisingly stable so on to 170x with a pair of Barlowed 9mm eyepieces. I thought no chance but then again nothing to lose but a little sleep so the 9mm EPs were replaced with 6mm using #8 filters.
Now it's operating at 256x, both planets looked very good (not perfect, but I'm yet to see perfect) and Jupiter's moons looked like discs as opposed to the point of a star. No whirls for me yet but nice banding and an occasional hint of some detail. I could see banding (ring shadow?) on Saturn, a tiny bit of planet disc below the ring and Cassini division was sharp.
Just for fun I went back over to the Double Double which featured clean, tight stars widely split. M57 was a suitable finish to a surprisingly fine evening.
Considering the lenses were operating at about two and a half times what they are designed to support I was very impressed. Combined with the ability to get 2.2 degrees at 29x it is a fairly versatile instrument.