Early seventies Maico big bores are probably the most competitive package you'll find for pre '75.
If they're maintained properly they're rock solid reliable, even as reliable as a "brick shithouse" CZ.
250 Maicos are equally as reliable but are burdened by a 4 speed box in an engine that's crying for a five speed and are very conservatively ported, translating as "kinda slow". They can be made very competitive with some rudimentary port and pipe work.
My pick of the pre '75 bunch would be a '74 400. Although not as straight line fast as a 440, it's a lot easier to ride, doesn't vibrate nearly as much and isn't really that much slower. For pre '70, the 350 square barrel is the pick but 360 and 400's are still pretty good. The square barrel isn't much slower than the radial so don't be put off by thinking the bike may be too far off the competitive scale.
Pricewise Maicos can be expensive but bargains do come along from time to time. Remember though that you get what you pay for. I've seen a couple of "bargain" Maicos in recent times that turned out to be far from bargains. Check the engine mounts for flogged out bolt holes and make sure the engine mount under the engine is in place. Many newbie Maico owner/builders inadvertently leave it out, not realising it's importance until their bike has shaken itself to bits. Check the steering head area for structural cracks and go through the usual used bike checklist and you'll be right. Enginewise Maicos are as close to bulletproof as any other pre '75 engine. Look for primary chain wear and clutch plate warpage. Be careful with fibreglass tanks deconstructing due to the additives in modern fuel. To be sure, internally coat the tank or use an alloy version. The front brake is kind of average but can be made to work with some careful setting up or replace it with a Yamaha conical item.
In stock trim you won't find a better handling bike than a Maico. The factory got the critical engine characteristics/suspension/frame geometry balance better than the opposition. They bring out the Adolf Weil in most of us, they're that forgiving to ride.
To answer the question Are early 70's Maico's easy to live with?, if the bike's a good one and set up correctly the answer is a resounding Yes.