OptPack (Nourie and Venta [Nourie, Francis J., E. R. Venta. 1991. Finding optimal line balances with OptPack. Oper. Res. Letters 10(April) 165--171.]) was published between the publication times of FABLE and EUREKA. This communication reports microcomputer computational experience with OptPack on Hoffmann's data sets following the pattern of Johnson (Johnson, Roger V. 1993a. Microcomputer performance of `FABLE' on Hoffmann's data sets. Management Sci. 39(10) 1190--1192.). Some insights about the computational effectiveness of the algorithms and some additional difficult problems are also presented.