I've had I think maybe two issues of the Prog go missing ever, in years and years of subscribing, and the sub droids are really good about sending a replacement. I wouldn't let that stop you subbing SBT.
The frequency is an issue, but that's out of Rebellion's control. I'm seriously considering cutting my sub over this - I don't find it exactly stressful, but not knowing when the Prog will drop is annoying. It used to be usually Saturday and occasionally Monday, now it's usually Tuesday but can be any time from Monday - Thursday. A Saturday Prog is like hens teeth nowdays. I'd rather walk out and buy it every Wednesday than get a very mild dose of disappointment most mornings. Also I'm not a completionist, so could skip Regened issues. Ymmv though and if this doesn't bother you the sub is still an awesome deal.
FWIW my copy of 2310 hasn't arrived yet but I don't really expect it till Tuesday / Wednesday when I may get 2310 and 2311 at once. Here's hoping!