£30 is very cheap, I would probably look elsewhere tbh.
I loved mine, but I really recommend going somewhere that specialises in lashes. The girl I went to first just did lashes, brows and nails and she did a great job, and they lasted a good 6 weeks, literally just coming out with my natural lashes. The next time I went I got them done at a spa, by a beautician who does waxing, facials, massage everything, and they were awful and were almost completely gone within two weeks. If you go to a lash specialist, they get much more practice doing lashes, so the results will be better.
I paid about 60 quid for mine I think.
I don't really wear make up day to day, so didn't do much cleansing around my eyes, but I think you do have to be careful they don't come out. They do look a bit silly when the last few are still hanging on, but you can always get them removed properly if you want, or get infills.
I didn't get any damage from mine at all, but I didn't fiddle with them much either.