Ive had semi permanent lashes for about 6 years now 
I absolutely love them! About three years ago, I switched to "Russian semi permanent lashes" which are great when you need more volume as well as length as I have sparse as well as short natural lashes. instead of one longer semi permanent lash to one of your own natural lash, with Russian lashes, "fans" of three or more lashes are created and bonded to your one lash.
They are more expensive, but the results are incredible. The result is that my lashes are much fuller. They are also a lot finer and feathery which I prefer. My lash technician charges £60 for a full set of Russian lashes and then £25 per fill which is a top up appointment which I have every 2.5 to 3 weeks.
You have to be careful using oil based cleaners and moisturisers as oils will weaken the glue, but I have learned to be careful around the eye area.
I barely use any eye make up as the lashes already make my eyes stand out, but if I do wear any for a night out etc, I use a home made solution to clean my lashes which my lash lady told me about ( which is on you tube) which consists of making up a solution using baby shampoo, water and baking soda. This is foamed up in a foaming bottle (£1 from the pound shop) and brushed on using a little lash brush I not ally get given after every appointment.
Go for it but..
Word to the wise - they are addictive! 