JTobias
I have just scraped through the CPL theory (fixed wing) and I would argue that very few people have a shorter attention span than I and especially when it comes to a lot of seemingly pointless material. I stretched it over the maximum 18 months from start to finish although this was not helped by having to spend 5/6 months of the year abroad. I did the distance learning through GTS in Bournemouth and can't recommend them highly enough. I only did it to obtain the FI rating in an effort to help out my local club but that was before the dreaded credit crunch when instructors were thin on the ground. To be honest improving my own standards may have had some bearing on it as well.
I also am at the PPL H license flight test stage although the numbers would need to come up before I would consider the helicopter FI.
If you have the time I would go for the CPL as the Irish would say if your not in you can't lose.
Solar