Hey Keith,
Sportrak's are really good off road and with some decent tyres there even better. I had mt's on mine and a small supension lift which went everywhere i pointed it, really nice to drive aswell.
Powerwise not quite as much pull as a 4trak, but the 1600cc is a tough reliable little unit. You can cruise nicely at 70 all day long with a resonable MPG.
If your looking to buy one the best thing to look over is the chas for rust/holes, it seems to be Daihatsu's only real weakness-both my 4trak & sporty had bits of welding here & there, but nothing major. Aside from that find one with s/h and that's had the belt replaced- it will go on forever.
TBH i really miss the sporty now it's gone, offroading in comfort for pennies. What more could you want!
If you have any more questions, it would be worth looking on
www.daihatsu-drivers.co.uk lots of infomation from other 4trak & sporty owners.
Regards
Phil