Tanzers in general are very popular boat with a good reputation for both build quality and reliability.
While some of the designs (notably 26, 28) are not likely to win any beauty pageants, esp the older window version, they were good boats that sailed well and engendered a strong following.
The 27 was IIRC originally a Paceship design, and as such is a more conventional looking boat. The example on YW (presumably the one you are dealing on) looks to be a good one.
1984 Fast/Nicholson 345 "FastForward"
".. there is much you could do at sea with common sense.. and very little you could do without it.."
Capt G E Ericson (from "The Cruel Sea" by Nicholas Monsarrat)