I remember the Computrol well, when living in the UK, it was sold under the Barfen label along with many darkroom gear and materials, a house-brand of a retailer. However I prefer the Watson, and I still have two, one a very late model and the other an original B&J bakelite one.
One tip: do not use regular Sellotape for attaching the film end to the spool shaft, use a half-inch wide masking tape, and leave a small gap between the shaft and the end of the film, this would prevent the film edge from riding up the spool flanges.