Lots of "this happened to me so it's true for everyone" opinions in here. I'll just give you my experience and opinion.
Before switching to latex I ran a couple mimakis.
Had an l25500 for about 7 years, just recently sold it for $2500. We currently have a 360 for our dedicated roll printer, and while we are not running MILES of decals, we do get orders for decals fairly regularly. And I can tell you the only time we've had any issues with running decals it ended up being the cutter that was the issue. As far as color issues, if we maintain the environment (temp, humidity, etc) that the printer is in, we can print roll after roll with zero color shift. We have had the 360 for about 18 months now and I just replaced all the print heads about 2 weeks ago. And honestly, only one head needed replacing but I'm big on color management and frankly I just wanted to replace them all. Are there lemons out there? Yup. There's also Roland lemons, Epson lemons, mimaki lemons (mimaki latex anyone?) etc etc
Truthfully it does take a little effort to maintain a consistent print environment, but it's all worth it when that ad agency calls and says "we have a 25 foot wall that we need wrapped tonight before the such-n-such festival tomorrow" and we can just load it up, hit print and start sticking it KNOWING our colors are good. Or when a client calls panicked because Tim thought Joan ordered the decals for the tradeshow, and Joan thought tim did...and we can say "relax, they'll be ready to pick up in the morning."