The customer gets a fixed budget every month for IT, so no surprises. The IT service provider has extra incentive to make sure there's no drama by being proactive with maintenance, and they get a predictable cash flow. If there's more work than usual in a given month, the service provider eats the extra cost, but on other months when there's less work, they make up for it. Because the service provider's main goal is to be proactive, they generally invest in tools to help support that goal that the break/fix shop does not. Some of those tools even allow them to fix common problems behind the scenes without ever having to interrupt staff, ultimately reducing wasted staffing costs that were incurred with a break/fix scenario.
Depending on how skilled the managed service provider is and how long they've been in business, they will often know about problems before the client's staff knows there's a problem. So, the problem could be fixed before anyone's even aware there was a problem.
If you're serious about finding a competent IT provider, do a search online or through the yellow pages for business computer services and ask them if they provide managed services or all you can eat plans.
Another way you find them is to talk to different management platforms and ask them for a referral to an IT company in your area. Some of the different management platforms are: Autotask/Datto , Connectwise , Continuum , Kaseya
A man is known by the company he organizes. -- Ambrose Bierce