Congrats on your purchase!
Having tried both the Pierce and Makawrap aftermarket grips, I can say that I did not care for either of them in the least. The Mak has a very comfortable grip-shape, which both of those greatly alter while also adding alot of width and changing contours. If you have large hands I presume the Pearce grip would be worthwhile, but if they are small to average I would recommend either the plain black East German grip with a rubber sleeve or the Bulgarian commercial grip. IMO.
Also I would recommend the Wolf extra power 19# spring. Seems to improve feeding and function, which in turn improves reliability.
Go to Makarov.com and read up, Karl Bloss has so much info you will be busy for weeks sorting through it. He also has the best Makarov related store in the world, unfortunately it is closed for the next month.
mlk18