Not sure what “SP” aids are.
My NHS Phonak Bolero Marvel M70 aid (fitted last week) is fitted with a thin tube and a power dome (my hearing has improved slightly so I don’t need a mould).
It works pretty well (I can hear what my kids are saying), lightweight, comfortable and easy to use. The audio quality and robustness of Bluetooth connection is solid to both my watch and my phone (you can pair two devices, but only one connected at a time, unlike my Spheres, 8 devices, 2 at a time).
The only issue I have is that it is battery (312) powered rather than rechargeable.
I’m very grateful to have it, I wasn’t expecting to get NHS aids for 6-18 months, hence buying some from Wholesale Hearing (who have been great).