I haven't got one altop1, but I did test ride one and found it a very comfortable bike. Really liked it but at the time it was £1599.so I passed. At £1299 it is fair value I feel. It has a 21" frame which suited me nicely being a tad over 6 feet tall. The rear suspension is basic coil spring, great for comfort but don't suspect a real offroad performance as with more expensive fs bikes. If you're looking for a road / cycleway and light trailwork bike I think it would be a really nice bike.
Regards