I've got a 1975 F28A which I have had a couple of years. I love it.
What kills Enstroms is water. ALL the bearings in mine were shot due to water ingress and corrosion. Lamiflexes in the UK are 5 year items (unless this has changed recently) and are expensive. $1000 ish each. Tracking is not a problem provided the rotor head is in good condition and the blades are reasonably matched. most older aircraft seem to have a random assortment of blades so if it won't track a blade swap may be the answer. Used blades are cheap and available and unlifed. Dampers can be a problem but mine were fixed and are now perfect. After a thorough refurbishment it is pretty reliable with no significant faults this year and only a failed starter last year. It is slow with cruise at 80 mph (not knots) and certainly not overpowered but provided kept under max weight is not a problem at low level in UK summer. I installed a graphic engine monitor and balanced fuel injectors so it will run according to John Deakins principles - well lean of peak - and at that burns around 8 imperial galls per hour and is cool and clean. Not that I do of course as the POH says mixture full rich at all times.
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Hot starts are not too bad althought the POH method is not the best in my experience.
It can be trimmed to fly hands off and can be steered by simply leaning in the seat. I do not find the controls in the least heavy. Anyone buying an old one should be prepared to spend a lot of time and money to make it right. When that is done it will be a cheap,safe helicopter.