I suspect the primary target for you question is men, because ISC and SPC is very different or men and women. Also bladder management is so individual, what suits one person won’t suits the next. But still, here’s my view, from a woman’s perspective, having done both.
I’ve been using ISC since January 2012. And mostly had very little trouble. A few UTIs, but actually less than most medical professionals would expect. But then I had a long period of feeling like I need a wee all the time, it was tested with urodynamics and didn’t seem to be caused by bladder spasms, but still … it was decided initially that I should try Botox. That didn’t work because basically I wasn’t having bladder spasms. So it was felt instillations of Cystistat might help. This is like an extra lining on the bladder wall introduced by syringe into the urethra.
That didn’t help either. So given that I was still having the same feeling of needing to wee even though I’ve never been incontinent (sphincters won’t open on demand so incontinence is pretty much impossible!) it was determined that it was urethritis. And we agreed to go ahead with an SPC. I did this in March. And it was fairly uneventful.
But I kept having the feeling like I had an infection (ie wanting to wee all the time), so tested it again and again. I had several infections but basically the GPs were saying ‘well you do have an SPC…’. Then I had wound infections. From having rare infections with ISC, in 4 months, I had 5 lots of antibiotics.
Eventually, I saw the urologist. She explained that having an SPC meant that there would always be bacteria in the bladder. Also that the wound infection could be cleared up. Regardless, I decided to get rid of the bloody thing. So she agreed to remove it then and there.
Ive gone back to ISC. I haven’t had an infection. The door is still open to put in another SPC in the future.
I hope this is helpful.