I don't think they are as good as they used to be, in certain respects. A client recently showed me his new 15.4" Satellite -- I can't remember the model number, but it was about £600 -- and after a succession of Toshibas, he's disappointed with the build and finish of this example. Despite being heavy for its size with a very thick chassis, it feels plasticky and has some flex. The lid is plastic rather than metal and it feels like it could crack if it takes a knock. The trackpad buttons are flimsy and springy. They should be quite a bit better than that, even at £600. This is not unique to Toshiba, though, sadly.
I have bought 3 Toshiba Laptops (2 for the work and 1 for myself)very good IMO not had any problems with them, as for Acer, I wouldn't touch them with a barge pole, mainly because of 2 different products I had that went wrong (1 was a burner that cost nearly £200 at the time and another was a issue I had with one of their laptops) and their customer service was bloody awful to say the least, swore I would never touch anything to do with Acer again and haven't