I have the SNT-30A version. They are nicely made units. I cannot directly compare it with a GSO at this time (no GSO's within fondling distance). I can compare it with an old JMI focuser however.
Mine came with no instructions.
This one weighs in at a tad over 1kg (1004g). It has a non-rotating base, though there are four grub screws in the base (2 each side) which may allow this (haven't tried). It is of quite solid construction with an excellent finish. The coarse focus control is ..er..um..coarse. It is a little 'lumpy' with substantial stiction. Definitely NOT silky smooth. A bit of torque is required to operate it. The fine focus is smooth and has much better 'feel'. The coarse knobs have knurled rubber grips, the fine knob is solid plastic. There is a tension control grub screw that works but requires an Allen key. I tweaked mine a little when I first got it. It supports my heaviest eyepiece (22mm T4 Nagler) and my Canon 40D with adapters easily and does not slip. There is no noticeable slop in the drawtube. The drawtube lock and compression ring thumb screws are nice and big and work well. The 2" compression ring on mine is very snug and actually needed a little attention when new. I had to remove it and carefully bend it by trial-and-error until all my 2" kit was easily inserted. The 1.25" ring was fine.
In comparison to my JMI unit: The JMI has a much smoother focus but it is only single speed and no compression rings. The LP also supports more weight. The LP also cost 50% of a new JMI.
Some specs:
Weight: 1004g
Travel: 30mm (has graduations in mm)
drawtube outer diameter: 58mm
Baseplate mounting holes: 6mm dia at 54mm x 91mm
Hope this helps!
Cheers,
Mark
