You already told correctly how things are around here...the Atlantic is owned by Finnish Lifeboat Society but operated by my lifeboat station. We have something like 14 or 15 A-21s in our organisation, all ex-RNLI boats. The one pictured here is former RNLI B-527, operated here since 1999.
What comes to sharp ice damages, we haven't encountered problems with that. We don't have any quick repair equipment onboard either. In heavy-duty RIBs tubes are multisectional, so if one deflates or gets punctured, other ones will cover the damaged one at least your way back to harbour or sometimes even the rest of the mission. In Atlantic I have had couple times deflated tube section (due material failure), but noted it only during post-op check at station. So puncture is not a problem at all.
Cold weather is problem sometimes, for example some plastic parts get broken while frozen, but no major difficulties have occured.