Very unreliable. Goat's Eye, the advanced chair, faces SW. The steepest runs traversing skier's left, face even more south and usually have considerable rocks.
Delirium Dive was been open 4 of the 7 days I have skied Sunshine. It is more likely open in March/April than in earlier months. My best day at Sunshine was the one I linked in Post #5 above from 2020 and was the only time I've been there when Wild West was open. Those 7 days at Sunshine were in 6 different seasons.
Despite less snowfall, the backside steeps at Lake Louise are much more reliable due to north exposure. Frontside south facing there is more intermediate and can be managed better with grooming.
Sunshine's SW exposure on Goat's Eye and NW on Continental Divide also result in wind scouring. It is remarkable in that climate zone how much better the snow is when leeward of the wind with deposition instead of scouring at Castle Mt. So I vote with my $: I have 21 days at Castle in 12 different seasons.
Would agree with the above. However, Delirium Dive has been open 100% of the time, albeit for a limited period of four visits (one in January, two in March, and one in April). I found it to be reasonably reliable terrain with high powder potential due to limited access. Goats Eye is as you described, and one has to be very lucky to catch it with good snow. There are some fun shots of the Teepee Town or Standish Lifts.
However, Lake Louise is the expert star of the Banff area. There are numerous unique sets of truly steep chutes in its Back Bowls. And curious about its expanded Front Side steeps with new lifts - looker's left. The ski area exhibits the best attributes of European off-piste areas: low capacity, extensive terrain, and the untracked regions where one can ski or not.
Of course, many North American areas rank as top expert zones, including Alta/Snowbird, Jackson/Targhee, Squaw/Alpine/Kirkwood, and Whistler. However, I would rank a road trip of Sunshine, Lake Louise, Kicking Horse, and Revelstoke - and perhaps add a snowcat/heli day - better than many of the above. Of course, there is the caveat of less snow, similar to the Alps; however, the combination of low skier density, extensive alpine terrain, and reasonable prices mitigates much of this.
My brother bought a Mountain Collective Pass this year to revisit these ski areas.
I have tried many permutations of the Alberta/BC 'Powder Highway' resorts; I have highlighted my preferred routes.
2002 Friends - Calgary: Banff/Sunshine+LL, Panorama, RK Heli, Fernie-2
2007: Solo - Whitefish: Big Mountain, Fernie-2, Red, Whitewater, Kicking Horse, Banff/Sunshine+LL, Norquay, Nakiska
2017: Brother - Calgary: Banff/Sunshine+LL, Kicking Horse-2, Revelstoke, Eagle Pass Heli (Purcell Heli - cancelled)
2018: Solo - Spokane: Silver MT, Schweitzer, Whitewater, Red-2, Big Red Cats
2019: Solo - Calgary: Banff/Sunshine+LL(2), Marmot Basin - 2
2022: Friends - Spokane: Big Red Cats, Valhalla Cats, Revelstoke, Eagle Pass Heli, K3 Cats, Stellar Heli
I will continue to avoid Kimberly and Fairmont Hot Springs. I need to convince my friends/brother to visit Fernie and Castle.
The Powder Highway
website BC-Only
I want to encourage a 'Southern Powder Highway' in the future with bases in Nelson and Fernie:
Powder Highway BC.