One of my friends graduated from DU SOL. According to him there are certain things you learn which will be beneficial for your career ahead.

• The important thing is you can get your degree as well as prepare for any competitive exam simultaneously. 
• If you need extra lessons, weekend classes are conducted. 
• You can also go through King Champion Guides and the last 10 years because it is the best to score good marks.
• CA, CS or CMA with Delhi university B.Com (H) degree will provide you a respectable job and also other similar opportunities.
• They have one of the best alumni networks.

It is suggested that you go for DU SOL only if it's your remaining option. Because some reviews of the placements are not that good, also if you want to prepare for UPSC, do it without getting involved in a college schedule. Though the time is flexible, ultimately it is your choice.