My wife has a Big Bear LS. The only thing I have had to replace (in two years) are the brake cables. Tyres are fine, gears work well and the rear rim and front mech discs work well. Whiilst my wife is not what you would call an adventurous cyclist,(60's latter leisure cyclist) we do live in West Wales and I have led her up and down some pretty vertiginous hills, without drama. The motor is impressive and is mostly ridden in power setting 2/5 with occasional use of 3 or 4/5. The range on the 15Ah battery has always been plenty for us, 36 miles around Penzance being our max, still battery left. My own Ezee is faster on equivalent setting level but on hills, when she ups the level, I will be left behind. I suspect that the Bear, being a 26" wheel, develops more torque than my 28" conversion.
The frame and battery rack are solid, handlebars too. The front forks are a little clunky but work well enough. (They are probably the part I would have wanted to change if it was my bike. But then I'm an ex-motorcyclist and just don't like the feel). The only component that has broken is a crack in the chain guard, fixed with a peice of Gorilla tape.
All in all for the price point and Wooshes' service, I think you can't go wrong.