Check the owners forums for each boat, I know with the Tiges, there were issues with say the 6.0 L MP engine around the 2007 year when we got our Ve. We have the 24Ve with almost 600 hours on it. We have only done regular service and changed the steering cable once. Zero problems, it has the 340HP MP engine. Our 2010 Tige RZ2 has over 150 hours on it and has only had some intermittent issues with the front ballast losing prime. It has the 343 PCM engine. I have heard of other tige owners with rough issues, but not the norm.
I have heard from many that Malibus are great, reliable boats, but I have a cousin that had tons of engine problems. Point being, there are bad stories with all, but check the owners forums and make sure you have a good dealer you can trust.