Good buy for 790 euro / 700 pounds?

I managed to get a deal of 790 euro on this bike, is it a good deal? (its cheaper than on the danish webpage)
https://www.cphbikeshop.dk/trek-x-calib ... erloo-blue
Specs:
Alpha Gold Aluminium, G2-geometry
•Front Fork: RockShox 30 Silver, air, preload, rebound, TurnKey lockout, E2 konisk styrrør, G2 geometri m. 51 mm offset på 29'ere, 100 mm vandring (13,5: 80 mm vandring)
•Tires: Bontrager XR2, 29x2,20˝ (13,5 & 15,5: 27,5x2,20˝)
•Gear: Shimano Deore XT, Shadow
•Weight: 17.5" - 13.06 kg / 28.80 lbs
It looks like a good air based fork and XT gears. A bit concerned about the tires, but i guess its not too expensive to upgrade.
Also should i go for size 17.5 or 18.5 for a 175 cm tall person?
https://www.cphbikeshop.dk/trek-x-calib ... erloo-blue
Specs:
Alpha Gold Aluminium, G2-geometry
•Front Fork: RockShox 30 Silver, air, preload, rebound, TurnKey lockout, E2 konisk styrrør, G2 geometri m. 51 mm offset på 29'ere, 100 mm vandring (13,5: 80 mm vandring)
•Tires: Bontrager XR2, 29x2,20˝ (13,5 & 15,5: 27,5x2,20˝)
•Gear: Shimano Deore XT, Shadow
•Weight: 17.5" - 13.06 kg / 28.80 lbs
It looks like a good air based fork and XT gears. A bit concerned about the tires, but i guess its not too expensive to upgrade.
Also should i go for size 17.5 or 18.5 for a 175 cm tall person?
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Posts
https://www.trekbikes.com/gb/en_GB/bike ... 8/p/21577/
Value I think its ok perhaps a little better priced than other similar bikes, seems like a decent cross country bike.
18.5 is 170-178
What is best for a beginner? Small or big size
If you are unsure what you need, I suggest visiting a bike shop and sitting on a few bikes. The Trek preferably however if its not available sit on a few different bikes of different sizes. You can then go home and compare bike geometry and size with the Trek which will help to understand the differences. If you do this, make sure you look at the bike geometry specification on the manufacture website, every bike will have a chart with some numbers.