Seagull have really lifted their game recently, and distributors appear to have lowered their pricing (at least they have in Australia and the U.K.) making Seagull ARFs better value than ever. Many of their newer offerings are laser cut (eg: Zero), and some of their venerable ones reworked to incorporate minor redesign and structural mods to correct previous flaws or improve the model. The Spacewalker II is amongst the latter.
Seagull's Spacewalker II comes highly recommended. A superb first low wing and/or taildragger. Flys very well, no vices. Lots of fun! The caveat? Seagull's manuals are indeed shockers! They don't revise and reprint them frequently enough to align with changes incorporated, or append them with an errata. You need to do your own 'amendments'. Read them thoroughly, famil yourself with the ARF assembly itself and don't follow the manual blindly step by step. Just use a modicum of common sense reasoning, and you won't have any problem. Just remember to trial fit and double check before you cut, bend, or glue anything.
Any .46 will fly it just fine. The plain bearing LA is one of the lower powered engines in this class, but will nevertheless fly the Spacewalker very well, and arguably, as it was originally intended to be flown. The only area in which the LA's performance could be criticised as lacklustre *in this model* will be in terms of pure vertical. Any respectable ballraced .46 will fix that. Anyone who suggests that such a .46 isn't enough for this model either hasn't a clue, should stick to pylon or really shouldn't be allowed out by themselves. ;)
Whilst the Spacewalker II will fly fast if you put a hot engine in it, nevertheless that was never its intended design brief, and it excels in graceful slower flight whilst not lacking anything in the way of sport acrobatic maneuverability. Think ARF junior Astro Hog and that pretty much sums up the Spacewalker. Commendation indeed.