OK, I've been using my XL SSR for a few days. I'm using a 3.7v Ego batt. I was very happy with the R5 XL-CE2's, but wanted something that held more juice. My thoughts...
Pros...huge juice capacity, solid construction, no leaking, decent vapor production.
Cons...Obtrusively large, no way to be inconspicuous with this thing. A little bit of a plastic taste (I can taste the juice better from the CE2...imho), doesn't seem to draw as easily as CE2-XL (R5)...even after adjusting the 901/510 adaptor. Vapor production is good, but again, not as good as a my CE2 (imho)
I just ordered a few of the 'Giant' clearomizers from Got Vapes...I'll let you know how those work out.
I vape Vaperite & KBV juices (50/50 12mg) and have used VR4, RY4 & V-Spot for testing this unit & CE2's