Lot's a personal opinions here, so I guess I will just add mine
I started using Wilson\Rogers mags in 82-83, at that time, they were 7's, I don't recall seeing any 8's show up until later in the 80's.
Wilson's have set the default standard, and are very much considered by many, the Very Best!
Les Baer's latest versions are pretty close copies of the Wilson design.
I have a number of the early Wilson Mag's, and for a long time, only trusted my 7's. With the newer profile lips, and longer base rail, I decided to seriously consider the 8 rounders again...
I am very happy with the 8's. I have not had any reliabilty issues at all...
The Feed Lips modifications did improve feeding of rounds other than Ball, and the longer base rail improved the strength of the base pad with the higher loads when that extra round was installed, and the mag inserted on a "Tactical" reload (Slide Closed).
With any 8 round mag, the most difficult task with be inserting a fully loaded mag into the gun with the slide in Battery. The 7 rounder's slide in easy, the 8's are a bit more tight.
With the 8's, ensure you have fresh Wolff Springs, and check your follower's, and you should not have any problems with locking open on the last round.
Some feel that the Plastic Follower is sweet since it's naturally slick, but prone to wear... Personally, I have not experienced any problems with Wilson followers, but I do wish that they offered a metal follower similar to the Mec-Gar's.
I have cracked lip's on the plastic base plates from over insertion, so for hard use, I do recommend using the metal bases.
Hope that helps...