Ericsons generally have a solid reputation - certainly on par with most other mainstream manufacturers. However many of these boats are getting long in the tooth, so each example needs a thorough going-over to be sure it's still in good shape. Neglect and abuse over the years can undo a lot of good.
Two friends have Ericsons - two very different boats, and both are happy with them.
One is an early 80s E33, a Ron Holland design, a good looking boat and a strong performer. This boat is proving to be a bit of a PHRF sleeper, good cockpit and reasonable accomodation. Price was EXTREMELY reasonable, but they have had to put in some TLC since then - to good effect.
The other is an '86 32 - Bruce King design and is very well equipped, esp now as the PO has upgraded extensively. They are a cruising couple that are very pleased with their boat, having upgraded from a Laser 28 - a pretty drastic change-up in many ways. These boats seem to hold their value quite well and are well regarded. Newer models have a less traditional (then) aft head layout.
Find a nice one, you probably won't go far wrong.