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Depends what telescope you intend on using it with and how old you are.
I have not seen the 15mm but the 30mm/80deg 1rpd is a fine well built solid eyepiece with a eye lens giving bright and clear images. However, it suffers from field curvature and the outer 30% particularly is out of focus when the centre is in focus. The severity of the curvature will depend on the focal length and ratio of your telescope. Whether your eye can adjust for the foucs will depend on your age, the younger the better. Not sure if the 15mm 1rpd would have the same field curvature as the 30mm.
The 30mm does Barlow well to give 15mm and perhaps the 15mm Barlows just as well to give a 7.5mm with 2" 2x Barlow. The eyepice will perform better in longer focal ratio telescopes.
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