I am running uberdata. When it was working correctly, it ran very well and pulled very hard. It is a fully capable program but the only issue you will have with uberdata is the lack of cold idle script, so you will notice that your cold idle will be very erratic.

Once I get the kinks worked out (which have nothing to do with the program, btw), it will be a very nice engine management system. I had to pick up an OBD1 P72, the chip kit, chip burner, OBD2a-OBD1 conversion harness, datalogging socket, and a wideband to make the setup complete, so it isn't "free". I would recommend Crome Pro instead of uberdata just because it is a more polished program with many more options and it allows finer tuning.