Pelvic floor exercisers.

Hi.
I have had PPMS for more than 20 years, so my muscle loss is now significant. I have recently been directed to a physiotherapist who has talked about the use of an electronic pelvic floor exerciser to attempt to strengthen the muscles to avoid the possibility of prolapse. She is interested to know, as I am, if anyone has had experience of such a device while suffering from MS. I should like to know what positives and negatives might be involved.
Thanks.
Frida.